| GCAA | Gambia Civil Aviation Authority 
| Others |
| GCAA | Garden City Athletic Association
| Others |
| GCAA | Gateway Center for Academic Achievement
| Others |
| GCAA | General Civil Aviation Authority
| Others |
| GCAA | Georgia Christian Athletic Association
| Others |
| GCAA | Georgia Collegiate Athletic Association
| Others |
| GCAA | Georgia Community Action Association
| Others |
| GCAA | Georgia Construction Aggregate Association
| Others |
| GCAA | Ghana Civil Aviation Authority
| Others |
| GCAA | Girard College Alumni Association
| Others |
| GCAA | Global Competence Aptitude Assessment
| Others |
| GCAA | Golf Coaches Association of America
| Others |
| GCAA | Grand Center Arts Academy
| Others |
| GCAA | Greater Cabarrus Athletic Association
| Others |
| GCAA | Greater Charlotte Apartment Association
| Others |
| GCAA | Greater Cleveland Athletic Association
| Others |
| GCAA | Greater Cleveland Auto Auction
| Others |
| GCAA | Gulf Coast Artists' Alliance
| Others |
| GCAA | Guyana Civil Aviation Authority
| Others |