| Abbreviation | Definition |
|---|---|
| GBSA | Georgia Blind Sports Association |
| GBSA | Graduate Biomedical Student Association |
| GBSA | Graduate Business Student Association |
| GBSA | Grandview Baseball Softball Association |
| GBSA | Greater Baltimore Swim Association |
| GBSA | Greenwich Bay Sailing Association |
| GBSA | Griffith Business Students Association |
| GBSA | Gulf Breeze Sports Association |
| GBSAGA | Georgian Bay Steam, Auto, Gas and Antique association |
| GBSCA | Greater Boston School Counselor Association |
| GBTA | Golden Belt Telephone Association |
| GBWA | Georgia Beer Wholesalers Association |
| GCA | Garand Collectors Association |
| GCA | Garden Centre Association |
| GCA | Gas Compressor Association |
| GCA | Gay Callers Association |
| GCA | Georgia Chiropractic Association |
| GCA | Green Coffee Association |
| GCA | Greeting Card Association |
| GCA | Gujarati Cultural Association |