D2

• 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 Exit D1 and D2.

• D2 motorway (Czech Republic)
• D2 road (Croatia), a state route in Croatia
• D2 motorway (Slovakia)

• 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", a 2002 episode of Dexter's Laboratory
• 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

• 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), published by Dagens Næringsliv
• D2, the IATA code for Damania Airways

• ATC code D02 Emollients and protectives, a subgroup of the Anatomical Therapeutic Chemical Classification System
• Dopamine receptor D₂, a protein
• Levuglandin D2
• Prostaglandin D₂ receptor, a G-protein coupled receptor
• Resolvin D2
• Cyclin D2 (CCND2)
• Vitamin D₂, 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

• Albatros D.II, a 1916 German fighter aircraft
• Aviatik (Berg) D.II, a 1917 -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

• 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

• 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

• HMS Attacker (D02), a 1941 American-built escort aircraft carrier
• HMS Devonshire (D02), a 1962 County-class destroyer
• 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

• Char D2, a French tank
• Zhidou D2, a Chinese small electric car

• 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

• D₂, the Codex Claromontanus, a 6th-century Greek-Latin uncial manuscript of the New Testament
• D₂, a dihedral group in group theory
• D₂, 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
• 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 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

• 2D (disambiguation)
• DII (disambiguation)

{{Letter-Number Combination Disambiguation}}