- 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)
