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{{wikt|D1}}
'''D1''', '''D01''', '''D.I''', '''D.1''' or '''D-1''' can refer to:

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==Science and technology==
===Biochemistry and medicine===
* [[ATC code D01]] ''Antifungals for dermatological use'', a subgroup of the Anatomical Therapeutic Chemical Classification System
* [[Dopamine receptor D1|Dopamine receptor D<sub>1</sub>]], a protein
* [[Haplogroup D1 (Y-DNA)]]
* Vitamin D<sub>1</sub>, a form of [[Vitamin D]]
* DI, [[Iodothyronine deiodinase]] type I, an enzyme involved with thyroid hormones

===Technology===
{{see also|#Military}}
* [[Nikon D1]], a digital single-lens reflex camera 
* D1, former brand of [[T-Mobile International AG|T-Mobile]] in Germany
* D1, an abbreviation for [[DOCSIS|DOCSIS 1.0]] 1.0, an international telecommunications standard
* [[D-1 (Sony)]], an early digital video recording format
* [[STS-61-A]], also known as D-1, the 22nd mission of NASA's Space Shuttle program
* D-1, from the [[Proton (rocket family)]], Russian rockets
* [[Mercedes D.I]], a 1913 German aircraft engine

==Military==
===World War I fighter aircraft===
* [[AEG D.I]]
* [[Albatros D.I]]
* Halberstadt D.I, experimental version of [[Halberstadt D.II]] (and Aviatik D.I variant)
* [[Aviatik (Berg) D.I]]
* [[Daimler D.I]]
* [[Deutsche Flugzeug-Werke]] D.I
* [[Euler D.I]]
* [[Flugzeugbau Friedrichshafen]] D.I
* [[Fokker D.I]]
* [[Hansa-Brandenburg D.I]]
* [[Junkers D.I]]
* [[Knoller D.I]], an [[Imperial and Royal Aviation Troops]] aircraft
* [[Phönix D.I]]
* [[Schütte-Lanz D.I]]
* [[Siemens-Schuckert D.I]]
* [[WKF D.I]], an [[Imperial and Royal Aviation Troops]] aircraft
===Other uses in military===
* [[Char D1]], a 1930s French tank
* [[Dewoitine D.1]], a 1920s French single-seat fighter aircraft
* [[Dunne D.1]], a 1907 British experimental aircraft 
* [[152 mm howitzer M1943 (D-1)]], a Soviet World War II artillery system
* {{HMS|D1}}, British early 20th century submarine
* {{USS|D-1|SS-17}}, a 1909 American submarine

==Transportation==
===Locomotives and trams===
* D1-class, a variant of [[D-class Melbourne tram]]
* [[D1 multiple unit]], a train built in 1960s-1980s in Hungary for Soviet railways
* [[LB&SCR D1 class]], an 1873 British tank locomotive
* NCC Class D1, a [[Northern Counties Committee]] Irish gauge steam locomotive
* [[Pennsylvania Railroad class D1]], an 1868 American steam locomotive
* [[Bavarian D I]], an 1871 Bavarian tank locomotive
* [[Min'an Electric D01]], a sports luxury vehicle

===Roads===
* [[D1 road (Croatia)]]
* [[D1 motorway (Czech Republic)]]
* [[D1 motorway (Slovakia)]]

===Other uses in transportation===
* D1, a model of [[BSA Bantam]] British motorcycle
* D1, a commuter rail line of [[Moscow Central Diameters]]
* [[D1 Denby Darts]], a bus service in Yorkshire, UK
* [[BYD D1]], an electric multi purpose vehicle (MPV)

==Sports==
* [[NCAA Division I]], D-I, the highest division of American collegiate athletics
* [[D1 Grand Prix]], a production car drifting series from Japan
* [[D1NZ]], a production car drifting series in New Zealand

==Other uses==
* [[D1 (building)]], a residential building in Dubai
* [[D1 (Longs Peak)]], a technical climbing route in Colorado, U.S.
* D1, a [[List of Dublin postal districts|Dublin postal district]]
* D1, a guitar model by [[C. F. Martin & Company]]
* D1, a code in [[Town and country planning in the United Kingdom]]
* D1, a transmitter equipped juvenile female bald eagle from the 2011 clutch of the [[Decorah Bald Eagles]]
*D1, a [[discount store]] chain from Colombia.
* [[D-1 visa]], a non-immigrant U.S. visa
* "D-1", a song from [[Yves (single)|''Yves'' (single)]] by Loona
* [[D1 Recordings]], an Irish independent techno record label
* D01, ECO code for the [[Richter-Veresov Attack]] chess opening
* [[Digital One]] - also known as D1 National, a digital radio multiplex in the United Kingdom
* ''[[Dhoom]]'', a 2004 Indian Hindi-language action film by Sanjay Gadhvi, first part of the Dhoom film series
* [[Diablo (video game)|Diablo]], a 1997 action role-playing video game by Blizzard Entertainment

== See also ==
* [[1D (disambiguation)]]
* [[Di (disambiguation)]]

{{Letter-Number Combination Disambiguation}}