| IGSA | Immunology Graduate Students Association 
| Others |
| IGSA | Independence Girls Softball Association
| Others |
| IGSA | Indian Grad Student Association
| Others |
| IGSA | Indian Graduate Student Association
| Others |
| IGSA | Indian Graduate Students Association
| Others |
| IGSA | Indigenous Graduate Student Association
| Others |
| IGSA | Industrial Gas Suppliers Alliance
| Others |
| IGSA | Informatics Graduate Student Association
| Others |
| IGSA | Interior Girls Softball Association
| Others |
| IGSA | International Graduate Student Association
| Others |
| IGSA | Interscan Gateway Security Appliance
| Others |
| IGSA | Iranian Graduate Students Association
| Others |
| IGSA | Irvine Girls Softball Association
| Others |