A12, A.12 or A-12 may refer to:
Aviation A-12 Shrike, a World War 2–era American attack aircraft Abrial A-12 Bagoas, a French experimental glider of the 1930s Aero A.12, a Czechoslovak light bomber built after World War I. Lockheed A-12, codenamed Oxcart, a high-altitude, high-speed reconnaissance aircraft, manufactured for the CIA McDonnell Douglas A-12 Avenger II, an early attempt by the US to develop stealth aircraft, cancelled due to cost overruns
Military Aggregate 12, a German rocket design in World War II that was never constructed , a French-built aircraft carrier in use by the Brazilian Navy , a British A-class submarine of the Royal Navy Matilda II (tank), built to General Staff specification A12, a British tank of World War 2.
Science and technology A12 Authentication, a CHAP-based mechanism used by a CDMA2000 Access Network to authenticate a 1xEV-DO Access Terminal ARM Cortex-A12, a 32-bit multicore processor Apple A12, a 7-nanometer 64-bit ARM SoC ATC code A12 Mineral supplements, a subgroup of the Anatomical Therapeutic Chemical Classification System British NVC community A12 (Potamogeton pectinatus community), a British Isles plant community A Rhodopsin-like receptors subfamily Samsung Galaxy A12, an Android phone
Other uses A12 road, in several countries Fiat A.12, a 1916 Italian, 6–cylinder, liquid-cooled in-line engine LSWR A12 class, an 1887 British steam locomotive model Queensland A12 class locomotive Queensland A12 small class locomotive Route A12 (WMATA), a bus route in Washington, US A12 scale, musical tuning based on the 4:7:10 triad English Opening (Encyclopaedia of Chess Openings code A12, among others) Unite the Right rally, referred to as "A12" locally, a white supremacist rally in Charlottesville, Virginia, which took place on August 12, 2017 X Æ A-12, the son of Elon Musk A12-Speed, a track in Trackmania United Forever & Nations Forever best known for its shortcut