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

Aviation

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  • 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

Military

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Science and technology

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Other uses

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  • 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.