View source for 2005 Basque regional election

{{Short description|Election in the Spanish region of the Basque Country}}
{{Infobox election
| election_name      = 2005 Basque regional election
| country            = Basque Country
| type               = parliamentary
| ongoing            = no
| previous_election  = 2001 Basque regional election
| previous_year      = 2001
| next_election      = 2009 Basque regional election
| next_year          = 2009
| outgoing_members   = 
| elected_members    = 
| seats_for_election = All 75 seats in the [[Basque Parliament]]
| majority_seats     = 38
| opinion_polls      = #Opinion polls
| registered         = 1,799,523 [[File:Red Arrow Down.svg|10px|Red arrow down]]0.8%
| turnout            = 1,223,634 (68.0%)<br/>[[File:Red Arrow Down.svg|10px|Red arrow down]]11.0 [[Percentage point|pp]]
| election_date      = 17 April 2005

<!-- PNV–EA -->
| image1         = [[File:Juan José Ibarretxe 2007 (cropped).jpg|170x170px]]
| leader1        = [[Juan José Ibarretxe]]
| party1         = [[PNV–EA]]
| leader_since1  = 31 January 1998
| leaders_seat1  = [[Álava (Basque Parliament constituency)|Álava]]
| last_election1 = 33 seats, 42.4%
| seats1         = 29
| seat_change1   = [[File:Red Arrow Down.svg|10px|Red arrow down]]4
| popular_vote1  = 468,117
| percentage1    = 38.4%
| swing1         = [[File:Red Arrow Down.svg|10px|Red arrow down]]4.0 [[Percentage point|pp]]

<!-- PSE–EE (PSOE) -->
| image2         = [[File:Patxi López 2010 (cropped).jpg|170x170px]]
| leader2        = [[Patxi López]]
| party2         = [[Socialist Party of the Basque Country–Basque Country Left|PSE–EE (PSOE)]]
| leader_since2  = 23 March 2002
| leaders_seat2  = [[Biscay (Basque Parliament constituency)|Biscay]]
| last_election2 = 13 seats, 17.8%
| seats2         = 18
| seat_change2   = [[File:Green Arrow Up Darker.svg|10px|Green arrow up]]5
| popular_vote2  = 274,546
| percentage2    = 22.5%
| swing2         = [[File:Green Arrow Up Darker.svg|10px|Green arrow up]]4.7 [[Percentage point|pp]]

<!-- PP -->
| image3         = [[File:María San Gil-2.jpg|170x170px]]
| leader3        = [[María San Gil]]
| party3         = People's Party of the Basque Country
| leader_since3  = 6 November 2004
| leaders_seat3  = [[Gipuzkoa (Basque Parliament constituency)|Guipúzcoa]]
| last_election3 = 19 seats, 22.9%
| seats3         = 15
| seat_change3   = [[File:Red Arrow Down.svg|10px|Red arrow down]]4
| popular_vote3  = 210,614
| percentage3    = 17.3%
| swing3         = [[File:Red Arrow Down.svg|10px|Red arrow down]]5.6 [[Percentage point|pp]]

<!-- PCTV/EHAK -->
| image4         = [[File:Portrait placeholder.svg|170x170px]]
| leader4        = [[Maite Aranburu]]
| party4         = Communist Party of the Basque Homelands
| leader_since4  = 2005
| leaders_seat4  = [[Biscay (Basque Parliament constituency)|Biscay]]
| last_election4 = 7 seats, 10.0%{{efn|name="EH"|Results for [[Euskal Herritarrok|EH]] in the 2001 election.}}
| seats4         = 9
| seat_change4   = [[File:Green Arrow Up Darker.svg|10px|Green arrow up]]2
| popular_vote4  = 150,644
| percentage4    = 12.4%
| swing4         = [[File:Green Arrow Up Darker.svg|10px|Green arrow up]]2.4 [[Percentage point|pp]]

<!-- EB–B -->
| image5         = [[File:Javier Madrazo 2007 (cropped).jpg|170x170px]]
| leader5        = [[Javier Madrazo]]
| party5         = United Left–Greens
| leader_since5  = 14 May 1994
| leaders_seat5  = [[Biscay (Basque Parliament constituency)|Biscay]]
| last_election5 = 3 seats, 5.5%{{efn|name="IU/EB"|Results for [[Ezker Batua|IU/EB]] in the 2001 election.}}
| seats5         = 3
| seat_change5   = [[File:Arrow Blue Right 001.svg|10px|Blue arrow right]]0
| popular_vote5  = 65,023
| percentage5    = 5.3%
| swing5         = [[File:Red Arrow Down.svg|10px|Red arrow down]]0.2 [[Percentage point|pp]]

<!-- Aralar -->
| image6         = [[File:Aintzane Ezenarro 2009 (cropped).jpg|170x170px]]
| leader6        = [[Aintzane Ezenarro]]
| party6         = Aralar (Basque political party)
| leader_since6  = 14 November 2004
| leaders_seat6  = [[Gipuzkoa (Basque Parliament constituency)|Guipúzcoa]]
| last_election6 = ''Did not contest''
| seats6         = 1
| seat_change6   = [[File:Green Arrow Up Darker.svg|10px|Green arrow up]]1
| popular_vote6  = 28,180
| percentage6    = 2.3%
| swing6         = ''New party''

<!-- map -->
| map = {{Switcher
| [[File:BasqueCountryProvinceMapParliament2005.png|x250px]]
| Vote winner strength by constituency
| [[File:BasqueCountryProvinceMapParliament2005.svg|x300px]]
| Election result by constituency
}}

<!-- bottom -->
| title           = [[Lehendakari]]
| before_election = [[Juan José Ibarretxe]]
| before_party    = Basque Nationalist Party
| after_election  = [[Juan José Ibarretxe]]
| after_party     = Basque Nationalist Party
}}
A regional election was held in the [[Basque Country (autonomous community)|Basque Country]] on Sunday, 17 April 2005, to elect the 8th [[Basque Parliament|Parliament]] of the [[Autonomous communities of Spain|autonomous community]]. All 75 seats in the Parliament were up for election.

The electoral coalition [[Basque Nationalist Party]]–[[Eusko Alkartasuna|Basque Solidarity]] (PNV–EA) won 29 seats, the [[Socialist Party of the Basque Country–Basque Country Left]] (PSE–EE) came second with 18 seats, the [[People's Party (Spain)|People's Party]] (PP) came in third with 15 seats. The controversial [[Communist Party of the Basque Homelands]] (PCTV/EHAK) won 9 seats, having been endorsed by the banned [[Batasuna]] party.

==Overview==
===Electoral system===
The [[Basque Parliament]] was the [[Devolution|devolved]], [[unicameral legislature]] of the [[Autonomous communities of Spain|autonomous community]] of the [[Basque Country (autonomous community)|Basque Country]], having legislative power in regional matters as defined by the [[Spanish Constitution of 1978|Spanish Constitution]] and the [[Statute of Autonomy of the Basque Country|Basque Statute of Autonomy]], as well as the ability to vote confidence in or withdraw it from a [[lehendakari]].<ref name="BasSoA">{{cite act |title=[[Statute of Autonomy of the Basque Country|Ley Orgánica 3/1979, de 18 de diciembre, de Estatuto de Autonomía para el País Vasco]] |type=Organic Law |number=3 |language=es |date=18 December 1979 |url=https://www.boe.es/buscar/act.php?id=BOE-A-1979-30177&tn=1&p=19791222 |access-date=17 July 2017}}</ref> Voting for the Parliament was on the basis of [[universal suffrage]], which comprised all nationals over 18 years of age, registered in the Basque Country and in full enjoyment of their political rights.

The 75 members of the Basque Parliament were elected using the [[D'Hondt method]] and a [[closed list]] [[proportional representation]], with an [[electoral threshold]] of three percent of valid votes—which included blank ballots—being applied in each constituency. Seats were allocated to constituencies, corresponding to the [[Provinces of Spain|provinces]] of [[Álava]], [[Biscay]] and [[Guipúzcoa]], with each being allocated a fixed number of 25 seats in order to provide for an equal parliamentary representation of the three provinces, as required under the regional statute of autonomy.<ref name="BasSoA"/><ref name="BasELaw">{{cite act |title=Ley 5/1990, de 15 de junio, de Elecciones al Parlamento Vasco |type=Law |number=5 |language=es |date=15 June 1990 |url=https://www.boe.es/buscar/act.php?id=BOE-A-2012-2859&tn=1&p=20050302 |access-date=17 July 2017}}</ref>

===Election date===
The term of the Basque Parliament expired four years after the date of its previous election, unless it was dissolved earlier. The election [[decree]] was required to be issued no later than the twenty-fifth day prior to the date of expiry of parliament and published on the following day in the Official Gazette of the Basque Country (BOPV), with election day taking place on the fifty-fourth day from publication. The [[2001 Basque regional election|previous election]] was held on 13 May 2001, which meant that the legislature's term would have expired on 13 May 2005. The election decree was required to be published in the BOPV no later than 19 April 2005, with the election taking place on the fifty-fourth day from publication, setting the latest possible election date for the Parliament on Sunday, 12 June 2005.<ref name="BasSoA"/><ref name="BasELaw"/>

The lehendakari had the prerogative to dissolve the Basque Parliament at any given time and call a [[snap election]], provided that no [[motion of no confidence]] was in process. In the event of an investiture process failing to elect a lehendakari within a sixty-day period from the Parliament re-assembly, the Parliament was to be dissolved and a fresh election called.<ref>{{cite act |title=Ley 7/1981, de 30 de junio, sobre Ley de Gobierno |type=Law |number=7 |language=es |date=30 June 1981 |url=https://www.boe.es/buscar/act.php?id=BOE-A-2012-5927&tn=1&p=20050302 |access-date=17 July 2017}}</ref>

==Parliamentary composition==
The table below shows the composition of the parliamentary groups in the chamber at the time of dissolution.<ref name="HE">{{cite web |url=https://www.historiaelectoral.com/aeuzkadi.html |title=Elecciones al Parlamento Vasco / Eusko Legebilitzarra (desde 1980) |language=es |website=Historia Electoral.com |access-date=24 December 2023}}</ref>

{| class="wikitable" style="text-align:left;"
|+ Parliamentary composition in February 2005<ref>{{cite web |url=https://www.legebiltzarra.eus/c_comorga_gru_L07.html |title=Parliamentarios y Órganos. Grupos. Composición. Históricos - VII Legislatura |language=es |website=[[Basque Parliament]] |access-date=24 December 2023}}</ref>
|-
! rowspan="2" colspan="2"| Groups
! rowspan="2" colspan="2"| Parties
! colspan="2"| Legislators
|-
! Seats
! Total
|-
| width="1" style="color:inherit;background:{{party color|Basque Nationalist Party}}"|
| Basque Nationalists Parliamentary Group
| width="1" style="color:inherit;background:{{party color|Basque Nationalist Party}}"|
| [[Basque Nationalist Party|EAJ/PNV]]
| 26
| '''26'''
|-
| style="color:inherit;background:{{party color|People's Party of the Basque Country}}"|
| Basque People's Parliamentary Group
| style="color:inherit;background:{{party color|People's Party of the Basque Country}}"|
| [[People's Party of the Basque Country|PP]]
| 19
| '''19'''
|-
| style="color:inherit;background:{{party color|Socialist Party of the Basque Country–Basque Country Left}}"|
| Basque Socialists Parliamentary Group
| style="color:inherit;background:{{party color|Socialist Party of the Basque Country–Basque Country Left}}"|
| [[Socialist Party of the Basque Country–Basque Country Left|PSE–EE (PSOE)]]
| 13
| '''13'''
|-
| bgcolor="black"|
| Patriotic Socialist Parliamentary Group
| bgcolor="black"|
| [[Batasuna]]
| 7
| '''7'''
|-
| style="color:inherit;background:{{party color|Eusko Alkartasuna}}"|
| Basque Solidarity Parliamentary Group
| style="color:inherit;background:{{party color|Eusko Alkartasuna}}"|
| [[Eusko Alkartasuna|EA]]
| 7
| '''7'''
|-
| bgcolor="gray"|
| Mixed Group
| style="color:inherit;background:{{party color|United Left–Greens}}"|
| [[United Left–Greens|EB–B]]
| 3
| '''3'''
|}

==Parties and candidates==
The electoral law allowed for [[Political party|parties]] and [[Political alliance|federations]] registered in the [[Ministry of the Interior (Spain)|interior ministry]], [[Electoral alliance|coalitions]] and [[Grouping of electors (Spain)|groupings of electors]] to present lists of candidates. Parties and federations intending to form a coalition ahead of an election were required to inform the relevant Electoral Commission within ten days of the election call, whereas groupings of electors needed to secure the signature of at least one percent of the electorate in the constituencies for which they sought election, disallowing electors from signing for more than one list of candidates.<ref name="BasELaw"/><ref name="SpaELaw">{{cite act |title=Ley Orgánica 5/1985, de 19 de junio, del Régimen Electoral General |type=Organic Law |number=5 |language=es |date=19 June 1985 |url=https://www.boe.es/buscar/act.php?id=BOE-A-1985-11672&tn=1&p=20031129 |access-date=28 December 2016}}</ref>

Below is a list of the main parties and electoral alliances which contested the election:

{| class="wikitable" style="line-height:1.35em; text-align:left;"
|-
! colspan="2" rowspan="2"| Candidacy
! rowspan="2"| Parties and<br/>alliances
! colspan="2" rowspan="2"| Leading candidate
! rowspan="2"| Ideology
! colspan="2"| Previous result
! rowspan="2"| {{abbr|Gov.|Government}}
! rowspan="2"| {{abbr|Ref.|References}}
|-
! Vote %
! Seats
|-
| width="1" style="color:inherit;background:{{party color|PNV–EA}}"|
| align="center"| '''[[PNV–EA]]'''
| {{Collapsible list
| title = List
| bullets = on
| [[Basque Nationalist Party]] (EAJ/PNV)
| [[Eusko Alkartasuna|Basque Solidarity]] (EA)
}}
| [[File:Juan José Ibarretxe 2007 (cropped).jpg|50px]]
| [[Juan José Ibarretxe]]
| [[Basque nationalism]]<br/>[[Christian democracy]]<br/>[[Conservative liberalism]]
| align="center"| 42.4%
| {{big|'''33'''}}
| {{ya}}
|
|-
| style="color:inherit;background:{{party color|People's Party of the Basque Country}}"|
| align="center"| '''[[People's Party of the Basque Country|PP]]'''
| {{Collapsible list
| title = List
| bullets = on
| [[People's Party of the Basque Country|People's Party]] (PP)
}}
| [[File:María San Gil-2.jpg|50px]]
| [[María San Gil]]
| [[Conservatism]]<br/>[[Christian democracy]]
| align="center"| 22.9%
| {{big|'''19'''}}
| {{na}}
| <ref>{{cite news |date=25 June 2004 |title=María San Gil liderará el PP en el País Vasco tras el congreso nacional |url=https://www.elmundo.es/elmundo/2004/06/25/espana/1088149482.html |language=es |newspaper=El Mundo |access-date=6 July 2020}}</ref><br/><ref>{{cite news |date=25 June 2004 |title=María San Gil será la candidata a 'lehendakari' por el PP para las próximas elecciones autonómicas |url=https://www.elmundo.es/elmundo/2004/06/24/espana/1088091276.html |language=es |newspaper=El Mundo |access-date=6 July 2020}}</ref><br/><ref>{{cite news |date=6 November 2004 |title=María San Gil, elegida presidenta del PP vasco con el 88% de los votos |url=https://www.lavanguardia.com/politica/20041106/51262800388/maria-san-gil-elegida-presidenta-del-pp-vasco-con-el-88-de-los-votos.html |language=es |newspaper=La Vanguardia |access-date=6 July 2020}}</ref>
|-
| style="color:inherit;background:{{party color|Socialist Party of the Basque Country–Basque Country Left}}"|
| align="center"| '''[[Socialist Party of the Basque Country–Basque Country Left|PSE–EE<br/>(PSOE)]]'''
| {{Collapsible list
| title = List
| bullets = on
| [[Socialist Party of the Basque Country–Basque Country Left]] (PSE–EE (PSOE))
}}
| [[File:Patxi López 2010 (cropped).jpg|50px]]
| [[Patxi López]]
| [[Social democracy]]
| align="center"| 17.8%
| {{big|'''13'''}}
| {{na}}
| <ref>{{cite news |date=23 March 2002 |title=Patxi López liderará a los socialistas vascos con un apoyo mayoritario del 57% |url=https://elpais.com/elpais/2002/03/23/actualidad/1016875017_850215.html |language=es |newspaper=El País |access-date=6 July 2020}}</ref><br/><ref>{{cite news |date=1 March 2005 |title=El hombre-talante vasco |url=https://www.elmundo.es/especiales/2005/03/espana/elecciones_pv/candidatos/lopez.html |language=es |newspaper=El Mundo |access-date=6 July 2020}}</ref>
|-
| style="color:inherit;background:{{party color|Communist Party of the Basque Homelands}}"|
| align="center"| '''[[Communist Party of the Basque Homelands|PCTV/EHAK]]'''
| {{Collapsible list
| title = List
| bullets = on
| [[Communist Party of the Basque Homelands]] (PCTV/EHAK)
}}
| [[File:Portrait placeholder.svg|50px]]
| [[Maite Aranburu]]
| [[Basque independence]]<br/>[[Abertzale left]]<br/>[[Communism]]
| align="center"| <br/>10.0%<br/>{{efn|name="EH"}}
| {{big|'''7'''}}
| {{na}}
|
|-
| style="color:inherit;background:{{party color|United Left–Greens}}"|
| align="center"| '''[[United Left–Greens|EB–B]]'''
| {{Collapsible list
| title = List
| bullets = on
| [[United Left–Greens]] (EB–B)
}}
| [[File:Javier Madrazo 2007 (cropped).jpg|50px]]
| Javier Madrazo
| [[Eco-socialism]]<br/>[[Social democracy]]<br/>[[Democratic socialism]]
| align="center"| <br/>5.5%<br/>{{efn|name="IU/EB"}}
| {{big|'''3'''}}
| {{ya}}
| 
|-
| style="color:inherit;background:{{party color|Alavese Unity}}"|
| align="center"| '''[[Alavese Unity|UA]]'''
| {{Collapsible list
| title = List
| bullets = on
| [[Alavese Unity]] (UA)
}}
| [[File:Portrait placeholder.svg|50px]]
| Enriqueta Benito
| [[Regionalism (politics)|Alavese regionalism]]<br/>[[Christian democracy]]
| colspan="2" {{n/a}}{{efn|[[Alavese Unity|UA]] contested the 1996 election in an electoral alliance with the [[People's Party of the Basque Country|PP]], securing 1 seat.}}
| {{na}}
| 
|-
| style="color:inherit;background:{{party color|Aralar (Basque political party)}}"|
| align="center"| '''[[Aralar (Basque political party)|Aralar]]'''
| {{Collapsible list
| title = List
| bullets = on
| [[Aralar (Basque political party)|Aralar]] (Aralar)
}}
| [[File:Aintzane Ezenarro 2009 (cropped).jpg|50px]]
| [[Aintzane Ezenarro]]
| [[Basque independence]]<br/>[[Left-wing nationalism]]<br/>[[Democratic socialism]]
| colspan="2" {{n/a}}
| {{na}}
| 
|}

==Opinion polls==
The table below lists voting intention estimates in reverse chronological order, showing the most recent first and using the dates when the survey fieldwork was done, as opposed to the date of publication. Where the fieldwork dates are unknown, the date of publication is given instead. The highest percentage figure in each polling survey is displayed with its background shaded in the leading party's colour. If a tie ensues, this is applied to the figures with the highest percentages. The "Lead" column on the right shows the percentage-point difference between the parties with the highest percentages in a poll. When available, seat projections determined by the polling organisations are displayed below (or in place of) the percentages in a smaller font; 38 seats were required for an [[absolute majority]] in the [[Basque Parliament]].

;{{smaller|Color key:}}
{{smaller|{{legend2|#EAFFEA|Exit poll|border=1px solid #AAAAAA}}}}

{| class="wikitable collapsible collapsed" style="text-align:center; font-size:95%; line-height:16px;"
|- style="height:42px;"
! style="width:250px;" rowspan="2"| Polling firm/Commissioner
! style="width:125px;" rowspan="2"| Fieldwork date
! style="width:50px;" rowspan="2"| Sample size
! style="width:45px;" rowspan="2"| Turnout
! style="width:35px;"| [[Basque Nationalist Party|PNV]]
! style="width:35px;"| [[File:People's Party (Spain) Logo (2000-2007).svg|33px|link=People's Party of the Basque Country|PP]]
! style="width:35px;"| [[File:Logotipo PSE-EE.svg|25px|link=Socialist Party of the Basque Country–Basque Country Left|PSE–EE (PSOE)]]
! style="width:35px;"| [[File:Logotipo de Euskal Herritarrok.svg|20px|link=Euskal Herritarrok|EH]]<br/>[[File:Logotipo de Batasuna.svg|35px|link=Batasuna]]
! style="width:35px;"| [[File:Logo EB-Berdeak.jpg|27px|link=United Left–Greens|EB–B]]
! style="width:35px;"| [[File:EA logo (1986–2008).svg|21px|link=Eusko Alkartasuna|EA]]
! style="width:35px;"| [[File:Unidad Alavesa.svg|35px|link=Alavese Unity|UA]]
! style="width:35px;"| [[File:Aralar logo.svg|32px|link=Aralar (Basque political party)|Aralar]]
! style="width:35px;"| [[File:Logotipo del Partido Comunista de las Tierras Vascas.svg|25px|link=Communist Party of the Basque Homelands|PCTV/EHAK]]
! style="width:30px;" rowspan="2"| Lead
|-
! style="color:inherit;background:{{party color|Basque Nationalist Party}};"|
! style="color:inherit;background:{{party color|People's Party of the Basque Country}};"|
! style="color:inherit;background:{{party color|Socialist Party of the Basque Country–Basque Country Left}};"|
! style="color:inherit;background:{{party color|Euskal Herritarrok}};"|
! style="color:inherit;background:{{party color|United Left–Greens}};"|
! style="color:inherit;background:{{party color|Eusko Alkartasuna}};"|
! style="color:inherit;background:{{party color|Alavese Unity}};"|
! style="color:inherit;background:{{party color|Aralar (Basque political party)}};"|
! style="color:inherit;background:{{party color|Communist Party of the Basque Homelands}};"|
|-
| colspan="14" style="background:#A0A0A0"|
|- style="background:#EFEFEF;"
| '''[[#Results|2005 regional election]]'''
| 17 Apr 2005
| {{N/A}}
| 68.0
| {{Party shading/PNV}}| '''38.4'''<br/>{{font|size=75%|font=Verdana|text=29}}
| 17.3<br/>{{font|size=75%|font=Verdana|text=15}}
| 22.5<br/>{{font|size=75%|font=Verdana|text=18}}
| –
| 5.3<br/>{{font|size=75%|font=Verdana|text=3}}
| {{efn|name="PNV"|Within [[Basque Nationalist Party|PNV]].}}
| 0.3<br/>{{font|size=75%|font=Verdana|text=0}}
| 2.3<br/>{{font|size=75%|font=Verdana|text=1}}
| 12.4<br/>{{font|size=75%|font=Verdana|text=9}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 15.9
|-
| colspan="14" style="background:#A0A0A0"|
|- style="background:#EAFFEA;"
| TNS Demoscopia/Antena 3{{efn-lr|name=fn1|[[Quick count]].}}<ref name="ExitPolls1" group="p">{{cite web |title=SONDEOS Y MUESTREOS: Baja el PNV, sube ETA y el PSE se coloca como segunda fuerza |url=https://www.libertaddigital.com/nacional/sondeos-y-muestreos-baja-el-pnv-sube-eta-y-el-pse-se-coloca-como-segunda-fuerza-1276249113/ |language=es |work=Libertad Digital |date=17 April 2005}}</ref><ref group="p">{{cite web |title=La jornada electoral, al minuto |url=http://www.elmundo.es/especiales/2005/03/espana/elecciones_pv/envivo.html |language=es |work=El Mundo |date=17 April 2005}}</ref>
| 17 Apr 2005
|?
|?
| {{Party shading/PNV}}|?<br/>{{font|size=75%|font=Verdana|text=28/30}}
|?<br/>{{font|size=75%|font=Verdana|text=14/15}}
|?<br/>{{font|size=75%|font=Verdana|text=18}}
| –
|?<br/>{{font|size=75%|font=Verdana|text=3}}
| {{efn|name="PNV"}}
| –
|?<br/>{{font|size=75%|font=Verdana|text=1}}
|?<br/>{{font|size=75%|font=Verdana|text=9/10}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"|?
|- style="background:#EAFFEA;"
| Ipsos–Eco/EITB{{efn-lr|name=fn1}}<ref name="ExitPolls2" group="p">{{cite web |title=Ibarretxe gana las elecciones pero no logra una mayoría clara para llevar adelante su plan |url=http://www.lavanguardia.com/politica/20050417/51262807884/ibarretxe-gana-las-elecciones-pero-no-logra-una-mayoria-clara-para-llevar-adelante-su-plan.html |language=es |work=La Vanguardia |date=17 April 2005}}</ref><ref group="p">{{cite web |title=El PSOE y el PP se consolidan por delante del tripartito |url=http://www.cadenaser.com:80/comunes/2005/eleccionesvascas/minuto.html |archive-url=https://web.archive.org/web/20050418185918/http://www.cadenaser.com/comunes/2005/eleccionesvascas/minuto.html |url-status=dead |archive-date=18 April 2005 |language=es |work=Cadena SER |date=17 April 2005 |access-date=24 February 2021 }}</ref>
| 17 Apr 2005
| 65,000
|?
| {{Party shading/PNV}}|?<br/>{{font|size=75%|font=Verdana|text=29/31}}
|?<br/>{{font|size=75%|font=Verdana|text=13/14}}
|?<br/>{{font|size=75%|font=Verdana|text=18}}
| –
|?<br/>{{font|size=75%|font=Verdana|text=3}}
| {{efn|name="PNV"}}
| –
|?<br/>{{font|size=75%|font=Verdana|text=1}}
|?<br/>{{font|size=75%|font=Verdana|text=9/10}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"|?
|- style="background:#EAFFEA;"
| Ipsos–Eco/RTVE<ref name="ExitPolls1" group="p"/><ref name="ExitPolls2" group="p"/><ref name="ExitPolls3" group="p">{{cite web |title=PNV-EA ganaría elecciones vascas sin mayoría absoluta-sondeos |url=https://www.20minutos.es/noticia/17322/0/ESPANA/ELECCIONES/PVASCO/ |language=es |work=20 minutos |date=17 April 2005}}</ref>
| 17 Apr 2005
|?
|?
| {{Party shading/PNV}}| '''40.3'''<br/>{{font|size=75%|font=Verdana|text=30/33}}
| 16.2<br/>{{font|size=75%|font=Verdana|text=13/15}}
| 22.5<br/>{{font|size=75%|font=Verdana|text=18/19}}
| –
| 6.0<br/>{{font|size=75%|font=Verdana|text=3/4}}
| {{efn|name="PNV"}}
| –
| 2.3<br/>{{font|size=75%|font=Verdana|text=0/1}}
| 11.0<br/>{{font|size=75%|font=Verdana|text=7/8}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 17.8
|- style="background:#EAFFEA;"
| TNS Demoscopia/Antena 3<ref name="ExitPolls1" group="p"/><ref name="ExitPolls2" group="p"/><ref name="ExitPolls3" group="p"/>
| 17 Apr 2005
|?
|?
| {{Party shading/PNV}}| '''39.9'''<br/>{{font|size=75%|font=Verdana|text=31/33}}
| 18.0<br/>{{font|size=75%|font=Verdana|text=14/16}}
| 18.2<br/>{{font|size=75%|font=Verdana|text=15/17}}
| –
| 6.1<br/>{{font|size=75%|font=Verdana|text=3/4}}
| {{efn|name="PNV"}}
| –
| 3.1<br/>{{font|size=75%|font=Verdana|text=1}}
| 11.3<br/>{{font|size=75%|font=Verdana|text=7/8}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 21.7
|- style="background:#EAFFEA;"
| Opina/Cadena SER<ref name="ExitPolls2" group="p"/><ref name="ExitPolls3" group="p"/>
| 17 Apr 2005
|?
|?
| {{Party shading/PNV}}| '''42.0'''<br/>{{font|size=75%|font=Verdana|text=31/33}}
| 16.0<br/>{{font|size=75%|font=Verdana|text=14/15}}
| 21.5<br/>{{font|size=75%|font=Verdana|text=17/18}}
| –
|?<br/>{{font|size=75%|font=Verdana|text=4/5}}
| {{efn|name="PNV"}}
| –
|?<br/>{{font|size=75%|font=Verdana|text=0/1}}
| 7.0<br/>{{font|size=75%|font=Verdana|text=5/6}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 20.5
|-
| Opina/El País<ref group="p">{{cite news |title=La irrupción del voto radical dificulta la mayoría absoluta del tripartito vasco |url=https://elpais.com/diario/2005/04/10/portada/1113084005_850215.html |language=es |work=El País |date=10 April 2005}}</ref><ref group="p">{{cite news |title=El voto a los radicales de EHAK pone en peligro la mayoría absoluta del actual Gobierno vasco |url=https://elpais.com/diario/2005/04/10/espana/1113084001_850215.html |language=es |work=El País |date=10 April 2005}}</ref>
| 10 Apr 2005
|?
|?
| {{Party shading/PNV}}| '''42.7'''<br/>{{font|size=75%|font=Verdana|text=34/35}}
| 15.1<br/>{{font|size=75%|font=Verdana|text=14/15}}
| 21.6<br/>{{font|size=75%|font=Verdana|text=18/19}}
| –
| 7.6<br/>{{font|size=75%|font=Verdana|text=3/4}}
| {{efn|name="PNV"}}
| –
| 2.3<br/>{{font|size=75%|font=Verdana|text=1}}
| 4.3<br/>{{font|size=75%|font=Verdana|text=2/4}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 21.1
|-
| Opina/Cadena SER<ref group="p">{{cite web |title=El PNV afronta la recta final de la campaña a cuatro escaños de la mayoría absoluta |url=http://cadenaser.com/ser/2005/04/11/espana/1113177012_850215.html |language=es |work=Cadena SER |date=11 April 2005}}</ref><ref group="p">{{cite web |title=Intención de voto elecciones autonómicas 2005. Total País Vasco (Pulsómetro 11/04/2005) |url=http://www.cadenaser.com:80/static/pulsometro/anteriores/encuesta_050411.htm |archive-url=https://web.archive.org/web/20050411223428/http://www.cadenaser.com/static/pulsometro/anteriores/encuesta_050411.htm |url-status=dead |archive-date=11 April 2005 |language=es |work=Cadena SER |date=11 April 2005 |access-date=24 February 2021 }}</ref>
| 10 Apr 2005
|?
|?
| {{Party shading/PNV}}| '''42.7'''<br/>{{font|size=75%|font=Verdana|text=34}}
| 15.1<br/>{{font|size=75%|font=Verdana|text=13/14}}
| 21.6<br/>{{font|size=75%|font=Verdana|text=18/19}}
| ''(3.4)''
| 7.6<br/>{{font|size=75%|font=Verdana|text=4/5}}
| {{efn|name="PNV"}}
| –
| 2.3<br/>{{font|size=75%|font=Verdana|text=1}}
| 4.3<br/>{{font|size=75%|font=Verdana|text=2/3}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 21.1
|-
| Opina/Cadena SER<ref group="p">{{cite web |title=El Partido Comunista de las Tierras Vascas, heredero del voto de Batasuna, aleja al PNV de la mayoría absoluta |url=http://cadenaser.com/ser/2005/04/10/espana/1113090612_850215.html |language=es |work=Cadena SER |date=10 April 2005}}</ref><ref group="p">{{cite web |title=Intención de voto elecciones autonómicas 2005. Total País Vasco (Pulsómetro 10/04/2005) |url=http://www.cadenaser.com:80/static/pulsometro/anteriores/encuesta_050410.htm |archive-url=https://web.archive.org/web/20050411054355/http://www.cadenaser.com/static/pulsometro/anteriores/encuesta_050410.htm |url-status=dead |archive-date=11 April 2005 |language=es |work=Cadena SER |date=10 April 2005 |access-date=24 February 2021 }}</ref>
| 9 Apr 2005
|?
|?
| {{Party shading/PNV}}| '''44.3'''<br/>{{font|size=75%|font=Verdana|text=35/36}}
| 14.5<br/>{{font|size=75%|font=Verdana|text=13}}
| 23.2<br/>{{font|size=75%|font=Verdana|text=18/20}}
| ''(2.9)''
| 6.6<br/>{{font|size=75%|font=Verdana|text=4}}
| {{efn|name="PNV"}}
| –
| 2.6<br/>{{font|size=75%|font=Verdana|text=1}}
| 3.7<br/>{{font|size=75%|font=Verdana|text=2/3}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 21.1
|-
| Opina/Cadena SER<ref name="Opina8Apr05" group="p">{{cite web |title=Intención de voto elecciones autonómicas 2005. Total País Vasco (Pulsómetro 09/04/2005) |url=http://www.cadenaser.com:80/static/pulsometro/anteriores/encuesta_050409.htm |archive-url=https://web.archive.org/web/20050411014902/http://www.cadenaser.com/static/pulsometro/anteriores/encuesta_050409.htm |url-status=dead |archive-date=11 April 2005 |language=es |work=Cadena SER |date=9 April 2005 |access-date=24 February 2021 }}</ref>
| 8 Apr 2005
|?
|?
| {{Party shading/PNV}}| '''45.7'''<br/>{{font|size=75%|font=Verdana|text=38/39}}
| 14.5<br/>{{font|size=75%|font=Verdana|text=13}}
| 23.5<br/>{{font|size=75%|font=Verdana|text=19/20}}
| ''(3.3)''
| 6.3<br/>{{font|size=75%|font=Verdana|text=4}}
| {{efn|name="PNV"}}
| –
| 1.9<br/>{{font|size=75%|font=Verdana|text=0}}
| 2.7<br/>{{font|size=75%|font=Verdana|text=0}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 22.2
|-
| Opina/Cadena SER<ref name="Opina8Apr05" group="p"/>
| 7 Apr 2005
|?
|?
| {{Party shading/PNV}}| '''43.5'''<br/>{{font|size=75%|font=Verdana|text=37/38}}
| 15.6<br/>{{font|size=75%|font=Verdana|text=13}}
| 24.5<br/>{{font|size=75%|font=Verdana|text=20/21}}
| ''(3.3)''
| 6.4<br/>{{font|size=75%|font=Verdana|text=4}}
| {{efn|name="PNV"}}
| 0.2<br/>{{font|size=75%|font=Verdana|text=0}}
| 1.6<br/>{{font|size=75%|font=Verdana|text=0}}
| 2.5<br/>{{font|size=75%|font=Verdana|text=0}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 22.2
|-
| Sigma Dos/El Mundo<ref group="p">{{cite web |title=El tripartito obtendrá mayoría absoluta en las elecciones vascas y el PCTV logrará cuatro escaños |url=http://www.elmundo.es/elmundo/2005/04/10/espana/1113103355.html |language=es |work=El Mundo |date=10 April 2005}}</ref><ref group="p">{{cite web |title=Intención de voto en el País Vasco |url=http://www.elmundo.es/elmundo/2005/graficos/abr/s2/sigma_dos_intencion.html |language=es |work=El Mundo |date=10 April 2005}}</ref>
| 5–7 Apr 2005
| 1,000
|?
| {{Party shading/PNV}}| '''45.6'''<br/>{{font|size=75%|font=Verdana|text=35/37}}
| 18.3<br/>{{font|size=75%|font=Verdana|text=15/16}}
| 20.8<br/>{{font|size=75%|font=Verdana|text=15/18}}
| –
| 5.5<br/>{{font|size=75%|font=Verdana|text=3}}
| {{efn|name="PNV"}}
| –
| 1.9<br/>{{font|size=75%|font=Verdana|text=0/1}}
| 6.6<br/>{{font|size=75%|font=Verdana|text=4}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 24.8
|-
| rowspan="2"| Noxa/La Vanguardia<ref group="p">{{cite web |title=El PNV repite victoria pero apenas avanza |url=http://hemeroteca.lavanguardia.com/preview/2005/04/10/pagina-20/39102751/pdf.html |language=es |work=La Vanguardia |date=10 April 2005}}</ref>
| rowspan="2"| 4–7 Apr 2005
| rowspan="2"| 900
|?
| {{Party shading/PNV}}| '''46.5'''<br/>{{font|size=75%|font=Verdana|text=34/36}}
| 19.7<br/>{{font|size=75%|font=Verdana|text=16}}
| 23.2<br/>{{font|size=75%|font=Verdana|text=19}}
| –
| 6.9<br/>{{font|size=75%|font=Verdana|text=3/5}}
| {{efn|name="PNV"}}
|?<br/>{{font|size=75%|font=Verdana|text=0/1}}
|?<br/>{{font|size=75%|font=Verdana|text=0/1}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 23.3
|-
|?
| {{Party shading/PNV}}| '''42.9'''<br/>{{font|size=75%|font=Verdana|text=32/34}}
| 18.2<br/>{{font|size=75%|font=Verdana|text=15}}
| 21.4<br/>{{font|size=75%|font=Verdana|text=17/19}}
| –
| 6.4<br/>{{font|size=75%|font=Verdana|text=3/4}}
| {{efn|name="PNV"}}
| 0.6<br/>{{font|size=75%|font=Verdana|text=0/1}}
| 2.1<br/>{{font|size=75%|font=Verdana|text=0/1}}
| 8.4<br/>{{font|size=75%|font=Verdana|text=5}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 21.5
|-
| Ikertalde/GPS<ref group="p">{{cite web |title=Elecciones Autonómicas 2005. Previsiones de voto (Abril 2005) |url=http://www.euskadi.eus/contenidos/documentacion/o_05pra2211/es_05pra221/adjuntos/05pra211.pdf |language=es |work=Basque Government |date=8 April 2005}}</ref><ref group="p">{{cite web |title=Vitoria tampoco da mayoría a PNV-EA |url=http://hemeroteca.lavanguardia.com/preview/2005/04/10/pagina-23/39102760/pdf.html |language=es |work=La Vanguardia |date=9 April 2005}}</ref>
| 1–7 Apr 2005
| 2,002
| 72.5
| {{Party shading/PNV}}| '''42.7'''<br/>{{font|size=75%|font=Verdana|text=34}}
| 15.8<br/>{{font|size=75%|font=Verdana|text=13}}
| 21.3<br/>{{font|size=75%|font=Verdana|text=18}}
| –
| 6.7<br/>{{font|size=75%|font=Verdana|text=3}}
| {{efn|name="PNV"}}
| 0.2<br/>{{font|size=75%|font=Verdana|text=0}}
| 2.6<br/>{{font|size=75%|font=Verdana|text=1}}
| 9.7<br/>{{font|size=75%|font=Verdana|text=6}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 21.4
|-
| Opina/Cadena SER<ref group="p">{{cite web |title=Ibarretxe asegura que "el clamor de la sociedad vasca" forzará la negociación entre Euskadi y Madrid |url=http://cadenaser.com/ser/2005/04/07/espana/1112831416_850215.html |language=es |work=Cadena SER |date=7 April 2005}}</ref><ref group="p">{{cite web |title=Intención de voto elecciones autonómicas 2005. Total País Vasco (Pulsómetro 07/04/2005) |url=http://www.cadenaser.com:80/static/pulsometro/anteriores/encuesta_050407.htm |archive-url=https://web.archive.org/web/20050407122658/http://www.cadenaser.com/static/pulsometro/anteriores/encuesta_050407.htm |url-status=dead |archive-date=7 April 2005 |language=es |work=Cadena SER |date=7 April 2005 |access-date=24 February 2021 }}</ref>
| 6 Apr 2005
|?
|?
| {{Party shading/PNV}}| '''45.7'''<br/>{{font|size=75%|font=Verdana|text=37/39}}
| 15.4<br/>{{font|size=75%|font=Verdana|text=13}}
| 21.4<br/>{{font|size=75%|font=Verdana|text=19/20}}
| ''(4.6)''
| 6.8<br/>{{font|size=75%|font=Verdana|text=5}}
| {{efn|name="PNV"}}
| 0.2<br/>{{font|size=75%|font=Verdana|text=0}}
| 2.0<br/>{{font|size=75%|font=Verdana|text=0}}
| 1.2<br/>{{font|size=75%|font=Verdana|text=0}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 24.3
|-
| LKS/Diario de Noticias<ref group="p">{{cite web |title=Dos sondeos quitan la mayoría absoluta al tripartito y otorgan entre cinco y seis escaños al PCTV |url=https://www.libertaddigital.com/nacional/dos-sondeos-quitan-la-mayoria-absoluta-al-tripartito-y-otorgan-entre-cinco-y-seis-escanos-al-pctv-1276248579/ |language=es |work=Libertad Digital |date=9 April 2005}}</ref>
| 30 Mar–6 Apr 2005
| 1,500
| 75
| {{Party shading/PNV}}|?<br/>{{font|size=75%|font=Verdana|text=33/35}}
|?<br/>{{font|size=75%|font=Verdana|text=16/17}}
|?<br/>{{font|size=75%|font=Verdana|text=15/17}}
| –
|?<br/>{{font|size=75%|font=Verdana|text=3/4}}
| {{efn|name="PNV"}}
| –
|?<br/>{{font|size=75%|font=Verdana|text=0/1}}
|?<br/>{{font|size=75%|font=Verdana|text=5}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"|?
|-
| Opina/Cadena SER<ref name="Opina5Apr05" group="p">{{cite web |title=Intención de voto elecciones autonómicas 2005. Total País Vasco (Pulsómetro 06/04/2005) |url=http://www.cadenaser.com:80/static/pulsometro/anteriores/encuesta_050406.htm |archive-url=https://web.archive.org/web/20050408055701/http://www.cadenaser.com/static/pulsometro/anteriores/encuesta_050406.htm |url-status=dead |archive-date=8 April 2005 |language=es |work=Cadena SER |date=6 April 2005 |access-date=24 February 2021 }}</ref>
| 5 Apr 2005
|?
|?
| {{Party shading/PNV}}| '''45.5'''<br/>{{font|size=75%|font=Verdana|text=36/38}}
| 15.3<br/>{{font|size=75%|font=Verdana|text=13}}
| 20.6<br/>{{font|size=75%|font=Verdana|text=18/20}}
| ''(6.4)''
| 6.7<br/>{{font|size=75%|font=Verdana|text=5}}
| {{efn|name="PNV"}}
| 0.2<br/>{{font|size=75%|font=Verdana|text=0}}
| 2.3<br/>{{font|size=75%|font=Verdana|text=1}}
| 0.2<br/>{{font|size=75%|font=Verdana|text=0}}
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 24.9
|-
| Opina/Cadena SER<ref name="Opina5Apr05" group="p"/>
| 4 Apr 2005
|?
|?
| {{Party shading/PNV}}| '''45.5'''<br/>{{font|size=75%|font=Verdana|text=37/39}}
| 16.0<br/>{{font|size=75%|font=Verdana|text=12}}
| 21.5<br/>{{font|size=75%|font=Verdana|text=19/20}}
| –
| 6.5<br/>{{font|size=75%|font=Verdana|text=4/5}}
| {{efn|name="PNV"}}
| –
| 3.5<br/>{{font|size=75%|font=Verdana|text=1}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 24.0
|-
| CIS<ref group="p">{{cite web |title=Preelectoral del País Vasco. Elecciones autonómicas 2005 (Estudio nº 2598. Marzo-Abril 2005) |url=http://www.cis.es/cis/export/sites/default/-Archivos/Marginales/2580_2599/2598/es259800mar_PVasco.pdf |language=es |work=CIS |date=8 April 2005}}</ref><ref group="p">{{cite web |title=Estudio CIS nº 2598. Ficha técnica |url=http://www.cis.es/cis/export/sites/default/-Archivos/Marginales/2580_2599/2598/ft2598.pdf |language=es |work=CIS |date=8 April 2005}}</ref><ref group="p">{{cite web |title=PNV-EA ganaría pero necesitaría a EB para obtener la mayoría, según una encuesta del CIS |url=http://www.elmundo.es/elmundo/2005/04/08/espana/1112955699.html |language=es |work=El Mundo |date=8 April 2005}}</ref>
| 29 Mar–4 Apr 2005
| 1,495
|?
| {{Party shading/PNV}}| '''42.5'''<br/>{{font|size=75%|font=Verdana|text=34/35}}
| 17.8<br/>{{font|size=75%|font=Verdana|text=16/17}}
| 22.2<br/>{{font|size=75%|font=Verdana|text=19}}
| –
| 6.2<br/>{{font|size=75%|font=Verdana|text=4}}
| {{efn|name="PNV"}}
| –
| 2.7<br/>{{font|size=75%|font=Verdana|text=1}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 20.3
|-
| Opina/Cadena SER<ref name="Opina5Apr05" group="p"/>
| 3 Apr 2005
|?
|?
| {{Party shading/PNV}}| '''45.0'''<br/>{{font|size=75%|font=Verdana|text=38/40}}
| 16.0<br/>{{font|size=75%|font=Verdana|text=12}}
| 21.5<br/>{{font|size=75%|font=Verdana|text=18/19}}
| –
| 7.0<br/>{{font|size=75%|font=Verdana|text=4/5}}
| {{efn|name="PNV"}}
| –
| 3.5<br/>{{font|size=75%|font=Verdana|text=1}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 23.5
|-
| Bergareche/Vocento<ref group="p">{{cite web |title=El tripartito PNV-EA-EB consolida su mayoría a la espera del "efecto EHAK" |url=http://hemeroteca.abc.es/nav/Navigate.exe/hemeroteca/madrid/abc/2005/04/10/014.html |language=es |work=ABC |date=10 April 2005}}</ref><ref group="p">{{cite web |title=Intención de voto |url=http://hemeroteca.abc.es/nav/Navigate.exe/hemeroteca/madrid/abc/2005/04/10/015.html |language=es |work=ABC |date=10 April 2005}}</ref>
| 1–3 Apr 2005
| 3,100
|?
| {{Party shading/PNV}}| '''40.4'''<br/>{{font|size=75%|font=Verdana|text=32/35}}
| 20.8<br/>{{font|size=75%|font=Verdana|text=16/19}}
| 18.3<br/>{{font|size=75%|font=Verdana|text=15/17}}
| ''(6.9)''
| 7.4<br/>{{font|size=75%|font=Verdana|text=4/6}}
| {{efn|name="PNV"}}
| 0.3<br/>{{font|size=75%|font=Verdana|text=0}}
| 3.7<br/>{{font|size=75%|font=Verdana|text=1/2}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 19.6
|-
| Opina/Cadena SER<ref name="Opina5Apr05" group="p"/><ref group="p">{{cite web |title=Segundo Pulsómetro: PNV-EA sigue manteniendo la mayoría absoluta |url=http://cadenaser.com/ser/2005/04/02/espana/1112399413_850215.html |language=es |work=Cadena SER |date=2 April 2005}}</ref>
| 1 Apr 2005
|?
|?
| {{Party shading/PNV}}| '''44.8'''<br/>{{font|size=75%|font=Verdana|text=38/39}}
| 16.0<br/>{{font|size=75%|font=Verdana|text=12}}
| 21.0<br/>{{font|size=75%|font=Verdana|text=19}}
| –
| 7.0<br/>{{font|size=75%|font=Verdana|text=4/5}}
| {{efn|name="PNV"}}
| –
| 3.5<br/>{{font|size=75%|font=Verdana|text=0/1}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 23.8
|-
| Celeste-Tel/La Razón<ref group="p">{{cite web |title=LA RAZÓN. 2005eko apirilak 3 |url=http://www.euskadi.net:80/elecinf/encuestas/abr05_razon_e.htm |archive-url=https://web.archive.org/web/20060619060026/http://www.euskadi.net/elecinf/encuestas/abr05_razon_e.htm |url-status=dead |archive-date=19 June 2006 |language=Basque |work=Celeste-Tel |date=3 April 2005 |access-date=24 February 2021 }}</ref>
| 29 Mar–1 Apr 2005
| 801
|?
| {{Party shading/PNV}}| '''42.9'''<br/>{{font|size=75%|font=Verdana|text=34/37}}
| 18.9<br/>{{font|size=75%|font=Verdana|text=15/18}}
| 22.9<br/>{{font|size=75%|font=Verdana|text=18/21}}
| –
| 6.0<br/>{{font|size=75%|font=Verdana|text=3/4}}
| {{efn|name="PNV"}}
| –
| 1.6<br/>{{font|size=75%|font=Verdana|text=1}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 20.0
|-
| Opina/Cadena SER<ref name="Opina5Apr05" group="p"/><ref group="p">{{cite web |title=La coalición PNV-EA lograría mayoría absoluta en el Parlamento Vasco |url=http://cadenaser.com/ser/2005/04/01/espana/1112313013_850215.html |language=es |work=Cadena SER |date=1 April 2005}}</ref>
| 31 Mar 2005
|?
|?
| {{Party shading/PNV}}| '''44.8'''<br/>{{font|size=75%|font=Verdana|text=38/39}}
| 16.6<br/>{{font|size=75%|font=Verdana|text=13/14}}
| 20.6<br/>{{font|size=75%|font=Verdana|text=17/18}}
| –
| 7.0<br/>{{font|size=75%|font=Verdana|text=4/5}}
| {{efn|name="PNV"}}
| –
| 3.5<br/>{{font|size=75%|font=Verdana|text=0/1}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 24.2
|-
| CIS<ref group="p">{{cite web |title=Situación política y social del País Vasco, XIV (Estudio nº 2593. Febrero-Marzo 2005) |url=http://www.cis.es/cis/export/sites/default/-Archivos/Marginales/2580_2599/2593/es259300mar_PVasco.html |language=es |work=CIS |date=30 March 2005}}</ref><ref group="p">{{cite web |title=Estudio CIS nº 2593. Ficha técnica |url=http://www.cis.es/cis/export/sites/default/-Archivos/Marginales/2580_2599/2593/ft2593.pdf |language=es |work=CIS |date=30 March 2005}}</ref><ref group="p">{{cite web |title=El PNV roza la mayoría absoluta o se la asegura con IU, según el CIS |url=http://hemeroteca.lavanguardia.com/preview/2005/03/31/pagina-18/39049248/pdf.html |language=es |work=La Vanguardia |date=31 March 2005}}</ref>
| 22 Feb–16 Mar 2005
| 1,499
|?
| {{Party shading/PNV}}| '''42.8'''<br/>{{font|size=75%|font=Verdana|text=35/37}}
| 19.1<br/>{{font|size=75%|font=Verdana|text=17}}
| 22.2<br/>{{font|size=75%|font=Verdana|text=18/19}}
| –
| 6.2<br/>{{font|size=75%|font=Verdana|text=3/4}}
| {{efn|name="PNV"}}
| 0.5<br/>{{font|size=75%|font=Verdana|text=0}}
| 1.2<br/>{{font|size=75%|font=Verdana|text=0}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 20.6
|-
| PSE<ref group="p">{{cite web |title=La última encuesta socialista |url=http://hemeroteca.abc.es/nav/Navigate.exe/hemeroteca/madrid/abc/2005/03/21/011.html |language=es |work=ABC |date=21 March 2005}}</ref>
| 1–11 Mar 2005
|?
|?
| {{Party shading/PNV}}| '''41.2'''<br/>{{font|size=75%|font=Verdana|text=33/35}}
|?<br/>{{font|size=75%|font=Verdana|text=15/16}}
| 23.7<br/>{{font|size=75%|font=Verdana|text=21/22}}
| –
|?<br/>{{font|size=75%|font=Verdana|text=3}}
| {{efn|name="PNV"}}
| –
|?<br/>{{font|size=75%|font=Verdana|text=1}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 17.5
|-
| Bergareche/Vocento<ref group="p">{{cite web |title=PNV-EA-EB alcanzan la mayoría absoluta |url=http://hemeroteca.abc.es/nav/Navigate.exe/hemeroteca/madrid/abc/2005/03/20/012.html |language=es |work=ABC |date=20 March 2005}}</ref>
| 1–8 Mar 2005
| 3,100
|?
| {{Party shading/PNV}}| '''43.3'''<br/>{{font|size=75%|font=Verdana|text=35/36}}
| 19.9<br/>{{font|size=75%|font=Verdana|text=16/18}}
| 20.4<br/>{{font|size=75%|font=Verdana|text=17/20}}
| ''(5.3)''
| 6.2<br/>{{font|size=75%|font=Verdana|text=3/5}}
| {{efn|name="PNV"}}
| –
| 3.2<br/>{{font|size=75%|font=Verdana|text=1/3}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 22.9
|-
| Opina/El País<ref group="p">{{cite news |title=El tripartito vasco alcanza la mayoría absoluta |url=https://elpais.com/diario/2005/02/27/espana/1109458801_850215.html |language=es |work=El País |date=27 February 2005}}</ref>
| 24–25 Feb 2005
| 1,500
|?
| {{Party shading/PNV}}| '''45.5'''<br/>{{font|size=75%|font=Verdana|text=36/37}}
| 19.5<br/>{{font|size=75%|font=Verdana|text=17}}
| 22.0<br/>{{font|size=75%|font=Verdana|text=18}}
| –
| 6.5<br/>{{font|size=75%|font=Verdana|text=3/4}}
| {{efn|name="PNV"}}
| –
| –
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 23.5
|-
| Ikertalde/GPS<ref group="p">{{cite web |title=Elecciones Autonómicas 2005. Previsiones de voto (Febrero 2005) |url=http://www.euskadi.eus/contenidos/documentacion/o_05pra111/es_05pra111/adjuntos/05pra111.pdf |language=es |work=Basque Government |date=February 2005}}</ref>
| 18 Jan–2 Feb 2005
| 2,874
| 75.0
| {{Party shading/PNV}}| '''41.1'''<br/>{{font|size=75%|font=Verdana|text=32}}
| 15.8<br/>{{font|size=75%|font=Verdana|text=13}}
| 22.3<br/>{{font|size=75%|font=Verdana|text=19}}
| 9.4<br/>{{font|size=75%|font=Verdana|text=7}}
| 6.7<br/>{{font|size=75%|font=Verdana|text=3}}
| {{efn|name="PNV"}}
| 0.3<br/>{{font|size=75%|font=Verdana|text=0}}
| 2.9<br/>{{font|size=75%|font=Verdana|text=1}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 18.8
|-
| CPS/EHU<ref group="p">{{cite web |title=Estimaciones Electorales del Euskobarómetro al Parlamento Vasco (Noviembre 2004) |url=http://www.ehu.es:80/cpvweb/pags_directas/euskobarometroFR.html |archive-url=https://web.archive.org/web/20050122031135/http://www.ehu.es/cpvweb/pags_directas/euskobarometroFR.html |url-status=dead |archive-date=22 January 2005 |language=es |work=EHU |date=20 January 2005 |access-date=24 February 2021 }}</ref><ref group="p">{{cite web |title=PNV-EA ganaría elecciones Euskadi, sin mayoría absoluta -sondeo |url=https://www.20minutos.es/noticia/811/0/OESTP/EUSKOBAROMETRO/ |language=es |work=20 minutos |date=20 January 2005}}</ref><ref group="p">{{cite news |title=La coalición PNV-EA ganaría los comicios vascos sin mayoría absoluta |url=https://elpais.com/diario/2005/01/21/espana/1106262013_850215.html |language=es |work=El País |date=21 January 2005 |last1=Bidaurrazaga |first1=Aitor Guenaga }}</ref>
| 8–26 Nov 2004
| 1,200
| 76
| {{Party shading/PNV}}| '''42.4'''<br/>{{font|size=75%|font=Verdana|text=33/35}}
| 18.1<br/>{{font|size=75%|font=Verdana|text=15/16}}
| 23.6<br/>{{font|size=75%|font=Verdana|text=21/22}}
| –
| 5.8<br/>{{font|size=75%|font=Verdana|text=3}}
| {{efn|name="PNV"}}
| –
| 3.1<br/>{{font|size=75%|font=Verdana|text=1}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 18.8
|- style="background:#EFEFEF;"
| '''[[Results breakdown of the 2004 European Parliament election in Spain#Basque Country|2004 EP election]]'''
| 13 Jun 2004
| {{N/A}}
| 44.6
| {{Party shading/PNV}}| '''35.3'''<br/>{{font|size=75%|font=Verdana|text=26}}
| 21.0<br/>{{font|size=75%|font=Verdana|text=17}}
| 28.2<br/>{{font|size=75%|font=Verdana|text=24}}
| –
| 4.2<br/>{{font|size=75%|font=Verdana|text=3}}
| 7.8<br/>{{font|size=75%|font=Verdana|text=5}}
| –
| 1.3<br/>{{font|size=75%|font=Verdana|text=0}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 7.1
|-
| CPS/EHU<ref name="CPSMay04" group="p">{{cite web |title=Estimaciones Electorales del Euskobarómetro al Parlamento Vasco (Mayo 2004) |url=http://www.ehu.es:80/cpvweb/paginas/euskobar_estimaciones.html |archive-url=https://web.archive.org/web/20040811042851/http://www.ehu.es/cpvweb/paginas/euskobar_estimaciones.html |url-status=dead |archive-date=11 August 2004 |language=es |work=EHU |date=16 July 2004 |access-date=24 February 2021 }}</ref><ref group="p">{{cite web |title=El Euskobarómetro no concede mayoría absoluta al tripartito vasco |url=http://cadenaser.com/ser/2004/07/16/espana/1089935418_850215.html |language=es |work=Cadena SER |date=16 July 2004}}</ref><ref group="p">{{cite news |title=El Gobierno tripartito vasco no lograría hoy la mayoría absoluta |url=https://elpais.com/diario/2004/07/17/espana/1090015216_850215.html |language=es |work=El País |date=17 July 2004 |last1=Bidaurrazaga |first1=Aitor Guenaga }}</ref>
| 3–28 May 2004
| 1,800
| 75
| {{Party shading/PNV}}| '''43.7'''<br/>{{font|size=75%|font=Verdana|text=32/34}}
| 17.5<br/>{{font|size=75%|font=Verdana|text=14/15}}
| 25.6<br/>{{font|size=75%|font=Verdana|text=22/23}}
| –
| 6.1<br/>{{font|size=75%|font=Verdana|text=3}}
| {{efn|name="PNV"}}
| {{efn|name="PP"|Within [[People's Party of the Basque Country|PP]].}}
| 4.3<br/>{{font|size=75%|font=Verdana|text=2}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 18.1
|- style="background:#EFEFEF;"
| '''[[Results breakdown of the 2004 Spanish general election (Congress)#Basque Country|2004 general election]]'''
| 14 Mar 2004
| {{N/A}}
| 75.0
| {{Party shading/PNV}}| '''33.7'''<br/>{{font|size=75%|font=Verdana|text=25}}
| 18.9<br/>{{font|size=75%|font=Verdana|text=16}}
| 27.2<br/>{{font|size=75%|font=Verdana|text=22}}
| –
| 8.2<br/>{{font|size=75%|font=Verdana|text=6}}
| 6.5<br/>{{font|size=75%|font=Verdana|text=5}}
| –
| 3.1<br/>{{font|size=75%|font=Verdana|text=1}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 6.5
|-
| CPS/EHU<ref group="p">{{cite web |title=Estimaciones Electorales del Euskobarómetro al Parlamento Vasco (Noviembre 2003) |url=http://www.ehu.es:80/cpvweb/paginas/euskobar_estimaciones.html |archive-url=https://web.archive.org/web/20040218134502/http://www.ehu.es/cpvweb/paginas/euskobar_estimaciones.html |url-status=dead |archive-date=18 February 2004 |language=es |work=EHU |date=16 January 2004 |access-date=24 February 2021 }}</ref><ref group="p">{{cite web |title=La mayoría absoluta en el Parlamento vasco dependería del escaño que disputan PSE e IU |url=http://hemeroteca.abc.es/nav/Navigate.exe/hemeroteca/madrid/abc/2004/01/17/014.html |language=es |work=ABC |date=17 January 2004}}</ref><ref group="p">{{cite news |title=El PNV y EA no consiguen mayoría absoluta, pese a la ausencia de Batasuna |url=https://elpais.com/diario/2004/01/17/paisvasco/1074372000_850215.html |language=es |work=El País |date=17 January 2004}}</ref>
| 3–21 Nov 2003
| 1,800
| 70
| {{Party shading/PNV}}| '''44.3'''<br/>{{font|size=75%|font=Verdana|text=33}}
| 24.1<br/>{{font|size=75%|font=Verdana|text=21}}
| 19.0<br/>{{font|size=75%|font=Verdana|text=16/17}}
| –
| 6.7<br/>{{font|size=75%|font=Verdana|text=3/4}}
| {{efn|name="PNV"}}
| {{efn|name="PP"}}
|?<br/>{{font|size=75%|font=Verdana|text=1}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 20.2
|- style="background:#EFEFEF;"
| '''[[2003 Basque foral elections|2003 foral elections]]'''
| 25 May 2003
| {{N/A}}
| 70.0
| {{Party shading/PNV}}| '''45.3'''<br/>{{font|size=75%|font=Verdana|text=35}}
| 19.6<br/>{{font|size=75%|font=Verdana|text=16}}
| 21.6<br/>{{font|size=75%|font=Verdana|text=17}}
| –
| 8.1<br/>{{font|size=75%|font=Verdana|text=5}}
| {{efn|name="PNV"}}
| 0.6<br/>{{font|size=75%|font=Verdana|text=1}}
| 3.2<br/>{{font|size=75%|font=Verdana|text=1}}
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 23.7
|- style="background:#EFEFEF;"
| '''[[Results breakdown of the 2003 Spanish local elections (Basque Country)#Overall|2003 local elections]]'''
| 25 May 2003
| {{N/A}}
| 69.9
| {{Party shading/PNV}}| '''43.9'''
| 18.7
| 22.1
| 0.9
| 8.0
| {{efn|name="PNV"}}
| 0.5
| 1.5
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 21.8
|-
| CPS/EHU<ref name="CPSMay04" group="p"/><ref group="p">{{cite web |title=Encuesta Euskobarómetro (Noviembre de 2002) |url=http://www.ehu.es:80/cpvweb/paginas/ultimoeusko/ultimoeusko_01.html |archive-url=https://web.archive.org/web/20030303180356/http://www.ehu.es/cpvweb/paginas/ultimoeusko/ultimoeusko_01.html |url-status=dead |archive-date=3 March 2003 |language=es |work=EHU |date=20 November 2002 |access-date=24 February 2021 }}</ref>
| 1–20 Nov 2002
| 1,200
|?
| {{Party shading/PNV}}| '''42.1'''<br/>{{font|size=75%|font=Verdana|text=31}}
| 21.3<br/>{{font|size=75%|font=Verdana|text=18}}
| 19.0<br/>{{font|size=75%|font=Verdana|text=16}}
| 9.3<br/>{{font|size=75%|font=Verdana|text=6}}
| 6.7<br/>{{font|size=75%|font=Verdana|text=4}}
| {{efn|name="PNV"}}
| {{efn|name="PP"}}
| –
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 20.8
|-
| CIS<ref group="p">{{cite web |title=Instituciones y autonomías, II. CA del País Vasco (Estudio nº 2455. Septiembre-Octubre 2002) |url=http://www.cis.es/cis/export/sites/default/-Archivos/Marginales/2440_2459/2455/e2455160.html |language=es |work=CIS |date=19 November 2002}}</ref><ref group="p">{{cite web |title=El PP, partido más votado en diez Comunidades Autónomas |url=http://estaticos.elmundo.es/elmundo/2002/graficos/nov/s3/cis1.pdf |language=es |work=El Mundo |date=19 November 2002}}</ref><ref group="p">{{cite web |title=El PP ganaría las autonómicas en diez Comunidades y el PSOE en cuatro, según el CIS |url=http://hemeroteca.abc.es/nav/Navigate.exe/hemeroteca/madrid/abc/2002/11/20/017.html |language=es |work=ABC |date=20 November 2002}}</ref>
| 9 Sep–9 Oct 2002
| 579
| 74.2
| {{Party shading/PNV}}| '''38.8'''
| 21.1
| 19.1
| 7.9
| 5.6
| 5.6
| –
| –
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 17.7
|-
| CPS/EHU<ref name="CPSMay04" group="p"/>
| 15–30 May 2001
|?
|?
| {{Party shading/PNV}}| '''43.6'''<br/>{{font|size=75%|font=Verdana|text=33}}
| 20.8<br/>{{font|size=75%|font=Verdana|text=19}}
| 18.0<br/>{{font|size=75%|font=Verdana|text=14}}
| 9.8<br/>{{font|size=75%|font=Verdana|text=6}}
| 6.3<br/>{{font|size=75%|font=Verdana|text=3}}
| {{efn|name="PNV"}}
| {{efn|name="PP"}}
| –
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 22.8
|-
| CPS/EHU<ref name="CPSMay04" group="p"/>
| 2–21 Nov 2001
|?
|?
| {{Party shading/PNV}}| '''43.5'''<br/>{{font|size=75%|font=Verdana|text=33}}
| 21.0<br/>{{font|size=75%|font=Verdana|text=19}}
| 18.1<br/>{{font|size=75%|font=Verdana|text=13}}
| 9.8<br/>{{font|size=75%|font=Verdana|text=7}}
| 6.1<br/>{{font|size=75%|font=Verdana|text=3}}
| {{efn|name="PNV"}}
| {{efn|name="PP"}}
| –
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 22.5
|-
| colspan="14" style="background:#A0A0A0"|
|- style="background:#EFEFEF;"
| '''[[2001 Basque regional election|2001 regional election]]'''
| 13 May 2001
| {{N/A}}
| 79.0
| {{Party shading/PNV}}| '''42.4'''<br/>{{font|size=75%|font=Verdana|text=33}}
| 22.9<br/>{{font|size=75%|font=Verdana|text=19}}
| 17.8<br/>{{font|size=75%|font=Verdana|text=13}}
| 10.0<br/>{{font|size=75%|font=Verdana|text=7}}
| 5.5<br/>{{font|size=75%|font=Verdana|text=3}}
| {{efn|name="PNV"}}
| {{efn|name="PP"}}
| –
| –
| style="background:{{party color|Basque Nationalist Party}}; color:white;"| 19.5
|-
| colspan="14" style="background:#A0A0A0"|
|-
| colspan="14"| {{notelist-lr}}
|}

==Results==
===Overall===
{| class="wikitable" style="text-align:right;"
|+ [[2001 Basque regional election#Overall|←]] Summary of the 17 April 2005 [[Basque Parliament]] election results [[2009 Basque regional election#Overall|→]]
|-
| colspan="7"| [[File:BasqueParliamentDiagram2005.svg|center|350px]]
|-
! style="text-align:left;" rowspan="2" colspan="2" width="525"| Parties and alliances
! colspan="3"| Popular vote
! colspan="2"| Seats
|-
! width="75"| Votes
! width="45"| %
! width="45"| ±[[Percentage point|pp]]
! width="35"| Total
! width="35"| +/−
|-
| width="1" style="color:inherit;background:{{party color|PNV–EA}}"|
| align="left"| [[PNV–EA|Basque Nationalist Party–Basque Solidarity]] ([[Basque Nationalist Party|PNV]]–[[Eusko Alkartasuna|EA]])
| 468,117 || 38.38 || style="color:red;"| −4.00
| '''29''' || style="color:red;"| −4
|-
| style="color:inherit;background:{{party color|Socialist Party of the Basque Country–Basque Country Left}}"|
| align="left"| [[Socialist Party of the Basque Country–Basque Country Left]] (PSE–EE (PSOE))
| 274,546 || 22.51 || style="color:green;"| +4.75
| '''18''' || style="color:green;"| +5
|-
| style="color:inherit;background:{{party color|People's Party of the Basque Country}}"|
| align="left"| [[People's Party of the Basque Country|People's Party]] (PP)
| 210,614 || 17.27 || style="color:red;"| −5.66
| '''15''' || style="color:red;"| −4
|-
| style="color:inherit;background:{{party color|Communist Party of the Basque Homelands}}"|
| align="left"| [[Communist Party of the Basque Homelands]] (PCTV/EHAK)<sup>1</sup>
| 150,644 || 12.35 || style="color:green;"| +2.31
| '''9''' || style="color:green;"| +2
|-
| style="color:inherit;background:{{party color|United Left–Greens}}"|
| align="left"| [[United Left–Greens]] (EB–B)<sup>2</sup>
| 65,023 || 5.33 || style="color:red;"| −0.20
| '''3''' || ±0
|-
| style="color:inherit;background:{{party color|Aralar (Basque political party)}}"|
| align="left"| [[Aralar (Basque political party)|Aralar]] (Aralar)
| 28,180 || 2.31 || ''New''
| '''1''' || style="color:green;"| +1
|-
| style="color:inherit;background:{{party color|Alavese Unity}}"|
| align="left"| [[Alavese Unity]] (UA)
| 4,117 || 0.34 || ''New''
| 0 || ±0
|-
| style="color:inherit;background:{{party color|Animalist Party Against Mistreatment of Animals}}"|
| align="left"| [[Confederation of the Greens|Greens]]–[[Animalist Party Against Mistreatment of Animals|Anti-Bullfighting Party Against Mistreatment of Animals]] (B–PACMA)
| 4,049 || 0.33 || ''New''
| 0 || ±0
|-
| style="color:inherit;background:{{party color|Internationalist Socialist Workers' Party}}"|
| align="left"| [[Internationalist Socialist Workers' Party]] (POSI)
| 2,354 || 0.19 || ''New''
| 0 || ±0
|-
| style="color:inherit;background:{{party color|Humanist Party (Spain)}}"|
| align="left"| [[Humanist Party (Spain)|Humanist Party]] (PH)
| 1,514 || 0.12 || style="color:red;"| −0.14
| 0 || ±0
|-
| style="color:inherit;background:{{party color|For a Fairer World}}"|
| align="left"| [[For a Fairer World]] (PUM+J)
| 1,261 || 0.10 || ''New''
| 0 || ±0
|-
| style="color:inherit;background:{{party color|Carlist Party (1970)}}"|
| align="left"| [[Carlist Party (1970)|Carlist Party of the Basque Country–Carlist Party]] (EKA–PC)
| 179 || 0.01 || style="color:red;"| −0.03
| 0 || ±0
|-
| align="left" colspan="2"| Blank ballots
| 9,001 || 0.74 || style="color:red;"| −0.07
| bgcolor="#E9E9E9" colspan="2"|
|-
| colspan="7" bgcolor="#E9E9E9"|
|- style="font-weight:bold;"
| align="left" colspan="2"| Total
| 1,219,599 || bgcolor="#E9E9E9" colspan="2"|
| 75 || ±0
|-
| colspan="7" bgcolor="#E9E9E9"|
|-
| align="left" colspan="2"| Valid votes
| 1,219,599 || 99.67 || style="color:green;"| +0.10
| bgcolor="#E9E9E9" colspan="2" rowspan="5"|
|-
| align="left" colspan="2"| Invalid votes
| 4,035 || 0.33 || style="color:red;"| −0.10
|- style="font-weight:bold;"
| align="left" colspan="2"| Votes cast / turnout
| 1,223,634 || 68.00 || style="color:red;"| −10.97
|-
| align="left" colspan="2"| Abstentions
| 575,889 || 32.00 || style="color:green;"| +10.97
|- style="font-weight:bold;"
| align="left" colspan="2"| Registered voters
| 1,799,523 || bgcolor="#E9E9E9" colspan="2"|
|-
| colspan="7" bgcolor="#E9E9E9"|
|-
| align="left" colspan="7"| Sources<ref name="HE"/><ref name="ResultsEus">{{cite web |url=http://www.euskadi.eus/web01-aphautes/es/ab12aAREWar/?locale=es |title=Election Results Archive |language=es |website=euskadi.eus |publisher=Basque Government |access-date=24 September 2017}}</ref>
|-
| colspan="7" style="text-align:left; max-width:790px;"| {{hidden|ta1=left|title='''Footnotes:'''|content={{ubl
| <sup>1</sup> [[Communist Party of the Basque Homelands]] results are compared to [[Euskal Herritarrok|Basque Citizens]] totals in the 2001 election.
| <sup>2</sup> [[United Left–Greens]] results are compared to [[Ezker Batua|United Left]] totals in the 2001 election.}}}}
|}

{{bar box
|title=Popular vote
|titlebar=#ddd
|width=550px
|barwidth=500px
|bars=
{{bar percent|[[PNV–EA]]|{{party color|PNV–EA}}|38.38}}
{{bar percent|[[Socialist Party of the Basque Country–Basque Country Left|PSE–EE (PSOE)]]|{{party color|Socialist Party of the Basque Country–Basque Country Left}}|22.51}}
{{bar percent|[[People's Party of the Basque Country|PP]]|{{party color|People's Party of the Basque Country}}|17.27}}
{{bar percent|[[Communist Party of the Basque Homelands|PCTV/EHAK]]|{{party color|Communist Party of the Basque Homelands}}|12.35}}
{{bar percent|[[United Left–Greens|EB–B]]|{{party color|United Left–Greens}}|5.33}}
{{bar percent|[[Aralar (Basque political party)|Aralar]]|{{party color|Aralar (Basque political party)}}|2.31}}
{{bar percent|Others|#777777|1.10}}
{{bar percent|Blank ballots|#DDDDDD|0.74}}
}}
{{bar box
|title=Seats
|titlebar=#ddd
|width=550px
|barwidth=500px
|bars=
{{bar percent|[[PNV–EA]]|{{party color|PNV–EA}}|38.67}}
{{bar percent|[[Socialist Party of the Basque Country–Basque Country Left|PSE–EE (PSOE)]]|{{party color|Socialist Party of the Basque Country–Basque Country Left}}|24.00}}
{{bar percent|[[People's Party of the Basque Country|PP]]|{{party color|People's Party of the Basque Country}}|20.00}}
{{bar percent|[[Communist Party of the Basque Homelands|PCTV/EHAK]]|{{party color|Communist Party of the Basque Homelands}}|12.00}}
{{bar percent|[[United Left–Greens|EB–B]]|{{party color|United Left–Greens}}|4.00}}
{{bar percent|[[Aralar (Basque political party)|Aralar]]|{{party color|Aralar (Basque political party)}}|1.33}}
}}

===Distribution by constituency===
{| class="wikitable sortable" style="text-align:right; line-height:20px;"
|-
! rowspan="3"| Constituency
! colspan="2" width="30px" class="unsortable"| [[PNV–EA]]
! colspan="2" width="30px" class="unsortable"| [[Socialist Party of the Basque Country–Basque Country Left|PSE–EE]]
! colspan="2" width="30px" class="unsortable"| [[People's Party of the Basque Country|PP]]
! colspan="2" width="30px" class="unsortable"| [[Communist Party of the Basque Homelands|EHAK]]
! colspan="2" width="30px" class="unsortable"| [[United Left–Greens|EB–B]]
! colspan="2" width="30px" class="unsortable"| [[Aralar (Basque political party)|Aralar]]
|-
! colspan="2" style="background:{{party color|PNV–EA}}"|
! colspan="2" style="background:{{party color|Socialist Party of the Basque Country–Basque Country Left}}"|
! colspan="2" style="background:{{party color|People's Party of the Basque Country}}"|
! colspan="2" style="background:{{party color|Communist Party of the Basque Homelands}}"|
! colspan="2" style="background:{{party color|United Left–Greens}}"|
! colspan="2" style="background:{{party color|Aralar (Basque political party)}}"|
|-
! data-sort-type="number"| %
! data-sort-type="number"| S
! data-sort-type="number"| %
! data-sort-type="number"| S
! data-sort-type="number"| %
! data-sort-type="number"| S
! data-sort-type="number"| %
! data-sort-type="number"| S
! data-sort-type="number"| %
! data-sort-type="number"| S
! data-sort-type="number"| %
! data-sort-type="number"| S
|-
| align="left"| [[Álava (Basque Parliament constituency)#2005 regional election|Álava]]
| style="background:{{party color|PNV–EA}}; color:white;"| 30.4
| '''8'''
| 25.3
| '''7'''
| 25.8
| '''7'''
| 13.2
| '''2'''
| 4.9
| '''1'''
| 1.5
| –
|-
| align="left"| [[Biscay (Basque Parliament constituency)#2005 regional election|Biscay]]
| style="background:{{party color|PNV–EA}}; color:white;"| 40.7
| '''11'''
| 23.2
| '''6'''
| 17.5
| '''5'''
| 10.0
| '''2'''
| 5.5
| '''1'''
| 1.6
| –
|-
| align="left"| [[Gipuzkoa (Basque Parliament constituency)#2005 regional election|Guipúzcoa]]
| style="background:{{party color|PNV–EA}}; color:white;"| 38.0
| '''10'''
| 20.1
| '''5'''
| 13.2
| '''3'''
| 18.1
| '''5'''
| 5.2
| '''1'''
| 3.9
| '''1'''
|- style="background:#CDCDCD;"
| align="left"| '''Total'''
| style="background:{{party color|PNV–EA}}; color:white;"| 38.4
| '''29'''
| 22.5
| '''18'''
| 17.3
| '''15'''
| 12.4
| '''9'''
| 5.3
| '''3'''
| 2.3
| '''1'''
|-
! colspan="13"|
|-
! style="text-align:left; font-weight:normal; background:#F9F9F9" colspan="13"| Sources<ref name="HE"/><ref name="ResultsEus"/>
|}

==Aftermath==
{| class="wikitable" style="text-align:center;"
|- bgcolor="#E9E9E9"
| colspan="6" align="center" bgcolor="#C0C0C0"| '''Investiture'''
|-
! colspan="2" width="275px"| Ballot →
! colspan="2"| 22 June 2005{{efn|name="Invalid"|7 [[Communist Party of the Basque Homelands|EHAK]] MPs cast invalid ballots in the 22 and 23 June votes.}}
! colspan="2"| 23 June 2005{{efn|name="Invalid"}}
|-
! colspan="2"| Required majority →
| colspan="2"| 38 out of 75
| colspan="2"| Simple
|-
! width="1px" style="background:{{party color|Basque Nationalist Party}};"|
| align="left"| {{Collapsible list | title = <span style="font-weight:normal; font-size:105%;">[[Juan José Ibarretxe]] ([[Basque Nationalist Party|PNV]])</span>
| • [[Basque Nationalist Party|PNV]] (21)
| • [[Eusko Alkartasuna|EA]] (8)
| • [[United Left–Greens|EB–B]] (3)
| • [[Communist Party of the Basque Homelands|EHAK]] (2)
}}
| {{Composition bar|34|75|{{party color|Basque Nationalist Party}}|width=125px}}
| {{xmark|15}}
| {{Composition bar|34|75|{{party color|Basque Nationalist Party}}|width=125px}}
| {{tick|15}}
|-
! style="color:inherit;background:{{party color|Socialist Party of the Basque Country–Basque Country Left}};"|
| align="left"| {{Collapsible list | title = <span style="font-weight:normal; font-size:105%;">[[Patxi López]] ([[Socialist Party of the Basque Country–Basque Country Left|PSE–EE]])</span>
| • [[Socialist Party of the Basque Country–Basque Country Left|PSE–EE]] (18)
| • [[People's Party of the Basque Country|PP]] (15)
}}
| {{Composition bar|33|75|{{party color|Socialist Party of the Basque Country–Basque Country Left}}|width=125px}}
| {{xmark|15}}
| {{Composition bar|33|75|{{party color|Socialist Party of the Basque Country–Basque Country Left}}|width=125px}}
| {{xmark|15}}
|-
! style="color:inherit;background:lightgray;"|
| align="left"| {{Collapsible list | title = <span style="font-weight:normal; font-size:105%;">Blank ballots</span>
| • [[Aralar (Basque political party)|Aralar]] (1)
}}
| colspan="2"| {{Composition bar|1|75|lightgray|width=125px}}
| colspan="2"| {{Composition bar|1|75|lightgray|width=125px}}
|-
! style="color:inherit;background:black;"|
| align="left"| <span style="font-weight:normal; font-size:105%;">Absentees</span>
| colspan="2"| {{Composition bar|0|75|black|width=125px}}
| colspan="2"| {{Composition bar|0|75|black|width=125px}}
|-
| align="left" colspan="6"| Sources<ref name="HE"/>
|}

==Notes==
{{notelist}}

==References==
;Opinion poll sources
{{reflist|group="p"}}

;Other
{{reflist}}

{{Basque elections}}
{{Regional elections in Spain in the 2000s}}

[[Category:2005 in the Basque Country (autonomous community)]]
[[Category:2005 regional elections in Spain|Basque Country]]
[[Category:Regional elections in the Basque Country (autonomous community)]]
[[Category:April 2005 in Spain]]