Other
- Aff (river), in western France
- A.F.F., an architectural term indicating "Above finished floor."
- AFF (Automated Flight Following), a system to automatically track aircraft in flight
- Aff., an abbreviation for affinis in biological nomenclature
- A Fine Frenzy, a singer
- Accelerated freefall, a method of skydiving training comprising a total of eight levels of jump with instructors and a number of solo consolidation jumps (minimum 10 with the British Parachute Association and 25 with the United States Parachute Association)
- Advance-fee fraud, a confidence trick in which the target is persuaded to advance relatively small sums of money in the hope of realizing a much larger gain
- Angels Fall First: Planetstorm, a video game (Also abbreviated as AFF:PS or simply PS to distinguish it from other games set in the same universe)
- The IATA airport code for the airfield at the United States Air Force Academy
- .aff, a filename extension used by:
- Advanced Forensics Format
- AGEMA infrared cameras (now part of FLIR Systems)
- AnyForm
- OpenOffice.org
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