| GASA | Gay Association of South Africa 
| Others |
| GASA | General Aviation Safety Assurance
| Others |
| GASA | Georgia Amateur Soccer Association
| Others |
| GASA | Geostatistical Association of Southern Africa
| Others |
| GASA | German American School Association
| Others |
| GASA | Gibberellic Acid Stimulated Arabidopsis
| Others |
| GASA | Graduate Astronomy Students Association
| Others |
| GASA | Greeks Against Sexual Assault
| Others |
| GASA | Grenada Amateur Swimming Association
| Others |
| GASA | Grenada Amateur Swimming Association's
| Others |
| GASA | Grid Accounting Services Architecture
| Others |
| GASA | Guardian Angel Settlement Association
| Others |
| GASA | Guernsey Amateur Swimming Association
| Others |