| Acronym | Meaning |
| ACAA | Affordable COTS for Aging Aircraft |
| ACAA | Air Carrier Access Act of 1986 |
| ACAA | Air Carrier Association of America |
| ACAA | Air Controlman Airman Apprentice (US Navy Rating) |
| ACAA | Alabama Coastal Area Act |
| ACAA | Allegheny County Airport Authority (Pennsylvania) |
| ACAA | Army Concept Analysis Agency (US Army) |
| ACAA | Auto-Calibrating Adaptive Array |
| ACAA | Automatic Chemical Agent Alarm |