- AMA(American Medical Association)
- AMAB(Associazione Mediterannea Agricoltura Biologica)
- AMAC(American Military Arms Corporation)
- AMAF(American Medical Association Foundation)
- AMAL(Authorized Medical Allowance List)
- AMAMS(Advanced Medium Anti-Tank Missile System)
- AMANDA((telescope) Antarctic Muon And Neutrino Detector Array, a neutrino telescope)
- AMAP(Advanced Modular Armor Protection)
- AMAPS(Aircraft, Missile, Avionics Performance Simulation)
- AMARC(Army Materiel Acquisition Review Committee)
- AMASE((software) Astrophysics Multi-spectral Archive Search Engine)
- AMATEUR(Oft referred as a novitiate, hobbyist, experimenter, novice, beginner, trainee, cadet, tenderfoot, student et al.)
- AMAWS(Advanced Medium Anti-Armor Weapons System)
- AMB(Ambilobe Airport)
- AMBA(Advanced Microcontroller Bus Architecture)
- AMBC-555PIA(Airborne Memorial Bridge Chapter 555th Parachute Infantry Association)
- AMBCS(Associate Member of the British Computer Society)
- AMBER(Americas Missing: Broadcast Emergency Response)
- AMBL(Air Maneuver Battle Lab)
- AMBO(Armenia, Macedonia, Bulgaria Oil pipeline)
- AMBUS(AMBulance BUS)
- AMC(United States Army Materiel Command)
