| AMSA | Advanced Manned Strategic Aircraft 
| Others |
| AMSA | Advanced Math and Science Academy
| Others |
| AMSA | Ahmadiyya Muslim Students' Association
| Others |
| AMSA | American Meat Science Association
| Others |
| AMSA | American Medallic Sculpture Association
| Others |
| AMSA | American Medical Student Association
| Others |
| AMSA | American Medical Students Association
| Others |
| AMSA | American Men's Studies Association
| Others |
| AMSA | American Mens Studies Association
| Others |
| AMSA | American Mini Sprint Association
| Others |
| AMSA | American Moving & Storage Association
| Others |
| AMSA | American Moving and Storage Association
| Others |
| AMSA | American Music Scholarship Association
| Others |
| AMSA | Anoka Middle School for the Arts
| Others |
| AMSA | Applied Math Science Academy
| Others |
| AMSA | Area Maintenance Support Activity
| Others |
| AMSA | Army Maintenance Support Activity
| Others |
| AMSA | Asian Medical Students Association
| Others |
| AMSA | Assam Medical Service Association
| Others |
| AMSA | Assateague Mobile Sportsfishermen's Association
| Others |
| AMSA | Association of Marist Schools Australia
| Others |
| AMSA | Association of Marist Schools of Australia
| Others |
| AMSA | Austin Men's Soccer Association
| Others |
| AMSA | Austin Mens' Soccer Association
| Others |
| AMSA | Australian Marine Science Association
| Others |
| AMSA | Australian Marine Sciences Association
| Others |
| AMSA | Australian Maritime Safety Authority
| Others |
| AMSA | Australian Medical Student's Association
| Others |
| AMSA | Australian Medical Students Association
| Others |
| AMSA | Australian Medical Students' Association
| Others |
| AMSA | Azienda Milanese Servizi Ambientali, S.p.A.
| Others |