ABM or Abm may refer to:
- ABM Industries, an American corporation
- ABM United Kingdom Limited, a United Kingdom software company
- Abahlali baseMjondolo, movement of South African shackdwellers
- Abertawe Bro Morgannwg University Health Board, an NHS Trust in Wales
- Account-based marketing, a targeted approach to marketing to a key account
- Activity-based management, a strategic decision-making method
- Agent-based model, a specific individual-based computational model for computer simulation
- Air Battle Manager, a rated flying position in the US Air Force
- Anti-ballistic missile, missile systems designed to counter ballistic missiles
- Anti-Ballistic Missile Treaty, a treaty between the USA and USSR
- Antique Boat Museum, a museum in Clayton, NY, USA
- Arturo Benedetti Michelangeli, an Italian classical pianist
- Associated British Maltsters, a malting company taken over by Dalgety plc
- Asynchronous Balanced Mode, a communication mode of HDLC and derivative protocols
- Automated banking machine, another term for Automated teller machine used mainly in Canada
- Bamaga Injinoo Airport (IATA airport code), in Queensland, Australia
- Uru: Ages Beyond Myst, an adventure computer game
- A-flat minor, commonly abbreviated as A♭m or Abm