| GSSC | General Secondary School Certificate 
| Others |
| GSSC | General Security Services Corporation
| Others |
| GSSC | General Studies Student Council
| Others |
| GSSC | Genome Sequencing Service Center
| Others |
| GSSC | Georgia Safe Schools Coalition
| Others |
| GSSC | Geriatric Services Support Coordinator
| Others |
| GSSC | Girl Scouts of South Carolina
| Others |
| GSSC | Girl Scouts of Suffolk County
| Others |
| GSSC | Global SATCOM (SATellite COMmunications) Support Center
| Others |
| GSSC | Global SATCOM Satellite Communications
| Others |
| GSSC | Global Shared Services Centre
| Others |
| GSSC | GNSS Science Support Centre
| Others |
| GSSC | Golden Soft Shell Crab
| Others |
| GSSC | Golden Student Success Center
| Others |
| GSSC | Graduate Student Steering Committee
| Others |
| GSSC | Graduate Student Success Center
| Others |
| GSSC | Grapevine Southlake Soccer Club
| Others |
| GSSC | Graphic Security Systems Corporation
| Others |
| GSSC | Greater Sacramento Surgery Center
| Others |
| GSSC | Greater South Shore Championships
| Others |
| GSSC | Gregory Seahurst Swim Club
| Others |
| GSSC | Ground Support Simulation Computer
| Others |
| GSSC | Ground Support Systems Contractor
| Others |
| GSSC | Gujarati Society of Southern California
| Others |
| GSSC | Gulf States Shipbuilders Consortium
| Others |