| Acronym | Definition |
|---|
| GSSA | Geological Society of South Africa |
| GSsA | Groupe pour une Suisse sans Armée (Switzerland) |
| GSSA | Grassland Society of Southern Africa |
| GSSA | Georgia School Superintendents Association |
| GSSA | Gay-Straight Student Alliance |
| GSSA | Georgia Sport Shooting Association |
| GSSA | Georgia State Soccer Association |
| GSSA | Genealogical Society of South Africa |
| GSSA | Georgia Youth Soccer Association |
| GSSA | Golden State Spirit Association |
| GSSA | Grapevine-Southlake Soccer Association |
| GSSA | Garden State Seafood Association |
| GSSA | Garden State Sighthound Association |
| GSSA | Global Standard Stratigraphic Age |
| GSSA | Gay Sport South Africa |
| GSSA | Generalized State Space Averaging |
| GSSA | Greater Sacramento Softball Association (California) |
| GSSA | General Sales and Service Agents |
| GSSA | Guernsey Social Security Authority |
| GSSA | Graduate Student Service Appointments |
| GSSA | Greater Sycamore Soccer Association |
| GSSA | Granite State Swimming Association |
| GSSA | gated static single assignment |
| GSSA | Gold Skull of St. Andrew (award) |
| GSSA | Graduate Student Sociology Association |
| GSSA | Greedy Single Switch Algorithm |
| GSSA | general supply support area (US DoD) |
| GSSA | Georgia Science Supervisors Association |
| GSSA | Gauteng Schools Sports Association |
| GSSA | Georgia Self Storage Association |
| GSSA | Garden State Sikh Association, Inc. |
| GSSA | General Support Supply Activity |
| GSSA | Guaranteed Share Scanner Algorithm |
| GSSA | General Sunday School Association (Universalist Church) |
| GSSA | Guild for the Study of Spatial Anomalies |
| GSSA | Global Security and Stability Agency |
| GSSA | Graduate Students Study Abroad |
| GSSA | gross specific surface area(s) |
| GSSA | Greater Sacramento Staging Association (California) |
| GSSA | Global Singers and Songwriters Association |
| GSSA | Generic Security Service Algorithm |