AFF
- A Fine Frenzy
- ASEAN Football Federation
- Accelerated freefall
- Adult FriendFinder
- Advance-fee fraud
- Advanced Fighting Fantasy
- Aff (river)
- Affine group
- Affluence stop
- Afghanistan Football Federation
- Afghanistan Freedom Front
- Animal Farm Foundation
- Arab Film Festival
- Armed Forces Foundation
- Aspies For Freedom
- Austin Film Festival
- Australian Fencing Federation
- Automated Flight Following
- United States Air Force Academy Airfield