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{{wiktionary|n3}}
'''N3''' may refer to:

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==Roads==
* [[N3 (Bangladesh)]], connecting Dhaka and Mymensingh
* [[N3 road (Belgium)]], one of the national roads in Belgium
* [[National Road 3 (Democratic Republic of the Congo)]]
* [[N3 road (Gabon)]]
* [[N3 road (Ghana)]]
* [[N3 road (Ireland)]], a National Primary Route
* [[N3 motorway (Netherlands)]], one of the national roads in the Netherlands
* [[N3 road (Oman)]]
* [[N3 road (Senegal)]], one of the national roads in Senegal
* [[N3 (South Africa)]], a road connecting Johannesburg to Durban
* [[Route nationale 3]], France

==Transportation==
* {{sclass2|N3|battleship|1}}, a Royal Navy battleship design that was never built
* {{USS|N-3|SS-55}}, a 1915 coastal defense submarine of the US Navy
* [[SP&S Class N-3]], a steam locomotives class from the [[Spokane, Portland and Seattle Locomotive Roster]]
* N<sub>3</sub>, gauges for monitoring a third section in a triple spool [[jet engine#Operation|jet engine]]
<!--* [[Revolutions per minute]], a term of the high-pressure compressor in a turbofan engine, expressed as a percentage of the maximum-->
* N3, IATA code for the Russian airline [[Omskavia]]
* N3, European [[large goods vehicle]]s above 12 tonnes
* N3 Pup - the [[Preceptor N3 Pup]]  ultralight aircraft (and derivatives)

==Science and technology==
* [[Haplogroup N (Y-DNA)]], a former human Y-chromosomal haplogroup, now N1c
* n-3, [[Omega-3 fatty acid]]
* [[Trinitrogen]] ({{chem2|N3}}), inorganic molecule composed of three nitrogen atoms
* {{chem2|N3-}}, an [[azide]] anion in chemistry
* {{chem2|N(3-)}}, a [[nitride]] anion in chemistry
* [[Non-small cell lung carcinoma staging#Lymph nodes (N)|N3 Lung cancer]], metastasis to certain lymph nodes
* N<sub>3</sub>, the genus three non orientable [[2-manifold|surface]]
* N3, ''cis''-bis(isothiocyanato)bis(2,2'-bipyridyl-4,4'-dicarboxylato)ruthenium(II), a red dye in [[dye-sensitized solar cell]]s
*N3, abbreviation for the [[3 nm process|3 nanometer process node]] in semiconductor technology

==Other==
* [[N3 (Calgary)]], condominium building
* [[N3 (NHS)]], the national broadband network for the English National Health Service
* [[Notation3]], or N3 rules, a textual notation for the Resource Description Framework
* N3, the third level of the [[Japanese-Language Proficiency Test]]
* N3, the most recent version of the [[Nagravision]] conditional access system for cable and satellite television
* N3, a postcode district in the [[N postcode area]] in London
* N3, the former name of [[NDR Fernsehen]], a German television channel

==See also==
* N03, the ICD-10 code for [[Nephritic syndrome]]
* [[ATC code N03]], ''Antiepileptics'', a subgroup of the Anatomical Therapeutic Chemical Classification System
* [[3N (disambiguation)]]
* [[List of highways numbered 3]]
* [[N road (disambiguation)]]

{{Letter-number combination disambiguation}}