A12

A12, A.12 or A-12 may refer to:

Aviation

 * A-12 Avenger II, a Cold War–era American aircraft project that was canceled prior to production
 * 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

Military

 * Aggregate 12, a German rocket design in World War II that was never constructed
 * BRAZILIAN AIRCRAFT CARRIER São Paulo, a French-built aircraft carrier in use by the Brazilian Navy
 * HMS A12, 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
 * Route A12 (WMATA), a bus route in Washington, USA
 * A12 scale, musical tuning based on the 4:7:10 triad
 * One of the Encyclopaedia of Chess Openings codes for the English Opening
 * 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
 * A highly desirable performance option for the 1969 Plymouth Road Runner and Dodge Super Bee with a 440 engine and special transmission and differential features.