AMS may stand for:

• Aerospace Material Specification
• Accelerator mass spectrometry or accelerator mass spectrometer.
• Acute mountain sickness, a type of medical condition.
• Additional Member System, a type of voting system.
• Alma Mater Society of Queen's University at Kingston , Canada, the university's primary student government.
• American Management Systems, a management and technology consulting company.
• American Mathematical Society, a professional society for mathematicians.
• American Meteor Society, an organization promoting observation of meteors and meteor showers.
• AMS Public Transport , the second largest public light bus (aka. minibus) company in Hong Kong.
• Arbetsmarknadsstryelsen , the Swedish National Labour Market Board .
• Auxillary Medical Service, a Hong Kong government sector that provides first aid and auxillary medical treatment.
• Arthur Morgan School , a small boarding school in the mountains of Wester North Carolina.
• Alenia Marconi Systems, an electronic Anglo-Italian company