| RGSA | Ralston Girls Softball Association 
| Others |
| RGSA | Raza Graduate Student Association
| Others |
| RGSA | Raza Graduate Student Association (cultural group; various universities)
| Others |
| RGSA | Reference Group on Small Arms (Inter-Agency Standing Committee Working Group; UN)
| Others |
| RGSA | Refined Gravitational Search Algorithm
| Others |
| RGSA | Richmond Girls Soccer Association
| Others |
| RGSA | Richmond Girls Softball Association
| Others |
| RGSA | Ridgeview Global Studies Academy
| Others |
| RGSA | Rio Grande Soaring Association
| Others |
| RGSA | Riverside Girls Softball Association
| Others |
| RGSA | Robert G Sinclair Architecture
| Others |
| RGSA | Rubenstein Graduate Student Association
| Others |
| RGSA | Ruston Girls Softball Association
| Others |