AMS
- AMS Pictures
- AMS radiocarbon dating
- Ablepharon macrostomia syndrome
- Aboriginal Medical Service
- Academy of Military Science (People's Republic of China)
- Academy of Military Science (United States)
- Accelerator mass spectrometry
- Access Method Services
- Acquisition Management System
- Acute muscle soreness
- Additional Member System
- Address Management System
- Advanced Music Systems
- Aerosol mass spectrometry
- Agricultural Marketing Service
- Alan Michael Sugar
- Alenia Marconi Systems
- Allyl methyl sulfide
- Alma Mater Society of Queen's University
- Alma Mater Society of the University of British Columbia
- Alpha Magnetic Spectrometer
- Alpha-methylstyrene
- Altered level of consciousness
- American Management Systems
- American Mathematical Society
- American Meteor Society
- American Meteorological Society
- American Montessori Society
- American Musicological Society
- American Samoa
- Ammonium sulfamate
- Ammonium sulfate
- Amsterdam (Amtrak station)
- Amsterdam Airport Schiphol
- Ancient Monuments Society
- Antimicrobial stewardship
- Antwerp Management School
- Army Map Service
- Army Medical School
- Army Medical Services
- Arthur Morgan School
- Association of Muslim Scholars
- Association of Muslim Schools
- Atlanta Motor Speedway
- Auto, Motor und Sport
- Automatic milking
- Auxiliary Medical Services
- Bambu Lab
- List of mine warfare vessels of the United States Navy
- Public employment service
- Sodium 2-anthraquinonesulfonate
- The House of the Dead (series)
- VHDL-AMS
- Verilog-AMS