| 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) |