| Acronym | Definition |
|---|
| IGAC➣Instituto Geográfico Agustín Codazzi (Spanish: Agustin Codazzi Geographical Institute; national geographical society; Colombia) |
| IGAC➣International Global Atmospheric Chemistry |
| IGAC➣Inspecção Geral das Actividades Culturais (Portuguese: Inspectorate General for Cultural Activities) |
| IGAC➣Investors Group Athletic Centre (Canada) |
| IGAC➣Integrated Global Atmospheric Chemistry (Seattle, WA) |
| IGAC➣Illinois Guardianship and Advocacy Commission (est. 1979) |
| IGAC➣Income-Generating Activities Committee |
| IGAC➣Industry-Government Advisory Council (forum; Canada) |