| GSSA | Garden State Seafood Association 
| Others |
| GSSA | Garden State Sikh Association
| Others |
| GSSA | Gender Sex and Sexuality Alliance
| Others |
| GSSA | Genealogical Society of South Africa
| Others |
| GSSA | General Sales and Service Agent
| Others |
| GSSA | General Supply Support Area
| Others |
| GSSA | Generic Security Service Algorithm
| Others |
| GSSA | Geological Society of South Africa
| Others |
| GSSA | Georgia School Superintendents Association
| Others |
| GSSA | Georgia State Service Assembly
| Others |
| GSSA | Girl Scouts of Southern Alabama
| Others |
| GSSA | Global Security and Stability Agency
| Others |
| GSSA | Global Singers and Songwriters Association
| Others |
| GSSA | Global Space Situational Awareness
| Others |
| GSSA | Global Standard Stratigraphic Age
| Others |
| GSSA | Global Surgery Student Alliance
| Others |
| GSSA | Golden State Spirit Association
| Others |
| GSSA | Graduate School Student Association
| Others |
| GSSA | Graduate Student Sociology Association
| Others |
| GSSA | Graduate Student Studies Association
| Others |
| GSSA | Graduate Studies Student Association
| Others |
| GSSA | Granite State Swim Association
| Others |
| GSSA | Grapevine Southlake Soccer Association
| Others |
| GSSA | Grapevine-Southlake Soccer Association
| Others |
| GSSA | Great Southern Sports Association
| Others |
| GSSA | Greater Sacramento Softball Association
| Others |
| GSSA | Greater Sycamore Soccer Association
| Others |
| GSSA | Ground Support Systems Activation
| Others |
| GSSA | Guernsey Social Security Authority
| Others |
| GSSA | Guided Missleman Seaman Apprentice
| Others |
| GSSA | Gujarati Samaj of San Antonio
| Others |