| Acronym | Definition |
|---|
| USAF | United States Air Force |
| USAF | United States Armed Forces (less common) |
| USAF | United States Aikido Federation |
| USAF | United Student Aid Funds |
| USAF | United States of Africa (political concept) |
| USAF | UK Student Accommodation Fund |
| USAF | Upper St. Anthony Falls (lock on the Mississippi River in Minneapolis, MN) |
| USAF | United States Arbitrage Finance II, LLC |
| USAF | United States Armwrestling Federation |
| USAF | US Aircraft Finance |
| USAF | University of South Alabama Foundation |
| USAF | United States of America Football |
| USAF | Universal Service and Access Fund |
| USAF | United States Aerobatic Foundation, Inc. (Possum Kingdom Lake, Texas) |
| USAF | Udayani Social Action Forum (Calcutta, India) |