D3, D03, D.III, D III or D-3 may refer to: Transportation Roads London Buses route D3, a Transport for London contracted bus route D3 motorway (Czech Republic), a motorway in the Czech Republic D3 road (Croatia), a state road in Croatia D3 motorway (Slovakia), a motorway in northern Slovakia Aircraft Albatros D.III, a 1916 German biplane fighter aircraft Dewoitine D.3, a Dewoitine aircraft Dunne D.3, a British Dunne aircraft Fokker D.III, a 1916 German single-seat fighter aircraft Mercedes D.III, a 1914 German 6-cylinder, liquid-cooled inline aircraft engine Phönix D.III, a variant of the Austro-Hungarian First World War Phönix D.I biplane fighter Pfalz D.III, a 1917 German fighter aircraft Schütte-Lanz D.III, a 1918 German fighter aircraft prototype Siemens-Schuckert D.III, a 1917 German prototype single-seat fighter aircraft Automobiles Ford D3 platform, a full-size car automobile platform Peugeot D3, a panel van manufactured from 1950 to 1955 Locomotives Bavarian D III, an 1897 steam locomotive model LB&SCR D3 class, an 1893 British 0-4-4 tank locomotive design GS&WR Class D3, a Great Southern and Western Railway Irish steam locomotive GNR Class D3, which was also classified D3 during LNER ownership Pennsylvania Railroad class D3, an 1869 American steam locomotive model Ships HMS Icarus (D03), a 1936 British Royal Navy destroyer HMS Ranee (D03), a 1943 British Royal Navy escort aircraft carrier USS D-3 (SS-19), a 1910 US Navy submarine Science and technology Dihedral group of order 6 (D3) D-brane, a class of p-branes in theoretical physics D-3 (video), an uncompressed composite digital video tape format Nikon D3, a professional-level digital SLR camera Biology and medicine ATC code D03 Preparations for treatment of wounds and ulcers, a subgroup of the Anatomical Therapeutic Chemical Classification System Dopamine receptor D3, a human gene Vitamin D3 (cholecalciferol), a type of Vitamin D Melanoma in situ (ICD-10 code: D03) Iodothyronine deiodinase type III Computing d3.js, Data Driven Documents, a JavaScript library for live web graphics based on changing data D3, a Pick database sold by Rocket Software DOCSIS 3, a cable modem standard Entertainment D3 Digivice, a device from the fictional anime/manga Digimon series D3 (Tenchi Muyo! Ryo-Ohki), a character in the anime Tenchi Muyo! D3: The Mighty Ducks, the third film in The Mighty Ducks trilogy Dedication 3, a Lil' Wayne and Young Money mixtape Dhoom 3, a 2013 Bollywood action movie Video games Descent 3, a 1999 computer game Diablo III, a 2012 action role-playing game PC