- AHAC stands for Affordable Housing Advisory Committee
- AHAC stands for Alternative Heating and Cooling Ltd. (Ireland)
- AHAC stands for Ancient and Honorable Artillery Company (Boston, MA)
- AHAC stands for Arne Hanna Aquatic Center (Bellingham, WA)
- AHAC stands for American Heart Association Council (cardiology)
- AHAC stands for Amplifon Hearing Aid Centers (Plymouth, MN)
- AHAC stands for American Heart Association Classification
AHAC