D1, D01, D.I, D.1 or D-1 can refer to:
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, a protein Haplogroup D1 (Y-DNA) Vitamin D1, a form of Vitamin D DI, Iodothyronine deiodinase type I, an enzyme involved with thyroid hormones
Technology
Nikon D1, a digital single-lens reflex camera Nikon D1X, an updated version of the D1 Nikon D1H, an updated version of the D1 D1, former brand of T-Mobile in Germany D1, an abbreviation for 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 , British early 20th century submarine , 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 BHP Port Kembla D1 class, an Australian diesel locomotive 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 Victorian Railways D1 class, an Australian steam locomotive Bavarian D I, an 1871 Bavarian tank locomotive Min'an Electric D01, a prototype electric sports car
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, a route of the D (SEPTA Metro) 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 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) 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, a 1997 action role-playing video game by Blizzard Entertainment
See also 1D (disambiguation) Di (disambiguation)