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{{wiktionary|d2|D2}}
'''D2''', '''D02''', '''D.II''', '''D II''' or '''D-2''' may refer to:

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==Places==
* [[Dublin 2]], a Dublin, Ireland postcode
* [[Mount Dulang-dulang]], the second highest mountain of the Philippines
* D2, a line of [[Moscow Central Diameters]]
* D2 Place One and Two, at Cheung Yue Street and Cheung Shun Street, in [[Cheung Sha Wan]], [[MTR]] [[Lai Chi Kok station|Lai Chi Kok Station]] Exit D1 and D2.

=== Highways ===

*[[D2 motorway (Czech Republic)]]
* [[D2 road (Croatia)]], a state route in Croatia
* [[D2 motorway (Slovakia)]]

==Arts & entertainment==
* [[D-2 (mixtape)|''D-2'' (mixtape)]], a 2020 album by South Korean rapper Agust D
* ''[[D2: The Mighty Ducks]]'', the second film in ''The Mighty Ducks'' trilogy
* [[R2-D2]], a robotic ''Star Wars'' character
* "[[D² (Dexter's Laboratory)|D²]]", a 2002 episode of ''Dexter's Laboratory''
* [[D2 (video game)|''D2'' (video game)]], a 1999 game for the Sega Dreamcast
* ''D2'', an abbreviation of the video game ''[[Diablo II]]'' or ''[[Destiny 2]]''
* D2, a sub-group of the Japanese male acting troupe [[D-Boys]]
* ''[[Dhoom 2]]'', a 2006 Indian Hindi-language action film by Sanjay Gadhvi, second part of the ''Dhoom'' film series

==Business==
* [[D2 (hotel chain)]], owned by Dusit Thani Group
* [[D2 Mannesmann]], the former name of Vodafone's German division, which resulted from the acquisition of the German company Mannesmann AG
* [[D2 (magazine)|''D2'' (magazine)]], published by ''Dagens Næringsliv''
* D2, the IATA code for [[Damania Airways]]

==Biology or medicine ==
* [[ATC code D02]] ''Emollients and protectives'', a subgroup of the Anatomical Therapeutic Chemical Classification System
* [[Dopamine receptor D2|Dopamine receptor D<sub>2</sub>]], a protein
* [[Levuglandin D2]]
* [[Prostaglandin D2 receptor|Prostaglandin D<sub>2</sub> receptor]], a G-protein coupled receptor
* [[Resolvin D2]]
* [[Cyclin D2]] (CCND2)
* Vitamin D<sub>2</sub>, or [[ergocalciferol]]
* D02, the [[ICD-10]] code for carcinoma in situ of middle ear and respiratory system
* [[DIO2]], Type II iodothyronine deiodinase, an enzyme involved in the thyroid system

==Vehicles==

===Aircraft===
* [[Albatros D.II]], a 1916 German fighter aircraft
* [[Aviatik (Berg) D.II]], a 1917 Austro-Hungarian fighter prototype
* [[STS-55]] or D2, the second German-sponsored Spacelab mission
* [[Daimler D.II]], a Daimler aircraft
* [[Delta D2]], an Australian diesel-powered helicopter design
* [[Dunne D.2]], a British Dunne aircraft
* [[Euler D.II]], a 1917 German single-seat fighter
* [[Fokker D.II]], a WWI German fighter biplane 
* [[Halberstadt D.II]], a 1916 German biplane fighter aircraft
* [[Hughes D-2]], a 1943 mysterious American fighter and bomber project
* [[LFG Roland D.II]], a 1917 German single-seat fighter
* [[Phönix D.II]], a variant of the Hungarian First World War biplane fighter D.I
* [[Schütte-Lanz D.II]], a 1915 variant of the German Schütte-Lanz D.I aircraft

===Aircraft engines===
* [[Alfa Romeo D2]], a 1931 Italian nine-cylinder radial engine for aircraft use 
* [[Mercedes D.II]], a WWI 6-cylinder, liquid-cooled inline aircraft engine

===Locomotives===
* [[Bavarian D II]], an 1898 German goods train tank locomotive model
* [[Bavarian D II (Ostbahn)]], an 1866 German goods train tender locomotive model
* [[Bavarian D II (old)]], an 1873 small tank locomotive
* GS&WR Class D2, a [[Great Southern and Western Railway]] Irish steam locomotive
* [[LB&SCR D2 class]], a British locomotive class
* [[GNR Class D2]], a class of British steam locomotives 
* [[PRR D2]], an 1868 American steam locomotive model

===Ships===
* [[HMS Attacker (D02)|HMS ''Attacker'' (D02)]], a 1941 American-built escort aircraft carrier
* [[HMS Devonshire (D02)|HMS ''Devonshire'' (D02)]], a 1962 County-class destroyer
* [[HMS Inglefield (D02)|HMS ''Inglefield'' (D02)]], a 1936 I-class destroyer and flotilla leader of the British Royal Navy
* {{USS|D-2|SS-18}}, a 1909 American submarine

===Other vehicles===
* [[Char D2]], a French tank
* [[Zhidou D2]], a Chinese small electric car

== Electronics==
* [[Cowon D2]], a 2007 portable media player with touch screen interface 
* [[Datasaab D2]], a Swedish concept computer completed in 1960
* ''d2'', a brand of computer peripherals manufactured by the French firm {{Lang|fr|électronique d2}}, now trading as [[LaCie]]
* ''D2 kit'', a microprocessor development kit [[MEK6800D2]]
* [[D-2 (video)]], a professional digital video format
* [[DOCSIS 2]], a cable modem standard

==Other uses==
* D<sub>2</sub>, the [[Codex Claromontanus]], a 6th-century Greek-Latin uncial manuscript of the New Testament
* D<sub>2</sub>, a [[dihedral group]] in group theory
* ''D<sub>2</sub>'', [[deuterium]], an isotope of hydrogen
* ''D2'', an almond-shaped cloud on [[Neptune]]
* D2, the code for permission to use specific land or premises for leisure (cinemas, swimming baths, gymnasiums) in [[town and country planning in the United Kingdom]]
* D2, the [[Double Dragon (hacking group)|Double Dragon hacking group]]
* [[Division II (disambiguation)]], in sports leagues, etc.
* [[Marcelo D2]] (born 1967), Brazilian rapper
* D2, an abbreviation for [[DOCSIS]] 2.0, an international telecommunications standard
* D2 steel, a type of D-Grade [[tool steel]] with good wear resistance commonly found in shears and high-end knives
* D2, gaming notation for a [[Dice#Rarer variations|2-sided die]], such as a coin
* D2, a standard [[paper size]] between B2 and A1
* [[D2 Subway]], a planned Dallas, Texas light rail tunnel
* D2, a route of the [[D (SEPTA Metro)]]

==See also==
* [[2D (disambiguation)]]
* [[DII (disambiguation)]]

{{Letter-Number Combination Disambiguation}}