Look up USAF in Wiktionary, the free dictionary.

USAF usually refers to the United States Air Force, the aerial warfare branch of the U.S. Armed Forces.

USAF may also refer to:

• United States Armed Forces itself, the military of the United States of America
• United Student Aid Funds, a nonprofit corporation that works to enhance postsecondary-education preparedness, access and success
• Upper Saint Anthony Falls, part of the Saint Anthony Falls
• Jane's USAF, a 1999 video game
• A common typo for UASF or "User Activated Soft Fork", a technique for updating Bitcoin and other blockchains