| ACASA | Ackoff Center for Advancement of Systems Approaches 
| Others |
| ACASA | Adult Clinic Assessment Software Application
| Others |
| ACASA | Albuquerque Chapter of the American Statistical Association
| Others |
| ACASA | Allegany Council on Alcoholism and Substance Abuse
| Others |
| ACASA | Amsterdam Centre for Ancient Studies and Archaeology
| Others |
| ACASA | Archives Of Czechs And Slovaks Abroad
| Others |
| ACASA | Arkansas Coalition Against Sexual Assault
| Others |
| ACASA | Arts Council of the African Studies Association
| Others |
| ACASA | Atlantic Climate Adaptation Solutions Association
| Others |