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

• 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 United States to develop stealth aircraft, cancelled due to cost overruns

• Aggregate 12, a German rocket design in World War II that was never constructed
• Brazilian aircraft carrier São Paulo (A12), 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

• 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

• 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.

Topics referred to by the same term

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