| Acronym | Definition |
|---|
| INAC | Indian and Northern Affairs Canada (government) |
| INAC | Interconnection Network Access Coordinator |
| INAC | Instituto Nacional de Carnes (Spanish: National Meat Institute, Uruguay) |
| INAC | Instituto Nacional de Acción Cooperativa (Spanish: National Institute of Cooperative Action; Argentina) |
| INAC | Instituto Nacional de Aviação Civil (Portugal) |
| INAC | Instituto Nacional de Aviación Civil (Spanish) |
| INAC | Isuzu North America Corporation (Anaheim, CA) |
| INAC | Interplanetary Ninja Assassin Claptrap (gaming) |
| INAC | International Nuclear Atlantic Conference |
| INAC | Institute for Nanoelectronics and Computing (Indiana) |
| INAC | Institut Nanosciences et Cryogénie (French: Institute for Nanoscience and Cryogenics) |