AFF, Aff or aff may refer to:
Organizations In sport Afghanistan Football Federation, the governing body of football in Afghanistan ASEAN Football Federation, a subset of nations within the Asian Football Confederation Australian Fencing Federation, the governing body of fencing in Australia
Other organizations Afghanistan Freedom Front, an anti-Taliban militant group Animal Farm Foundation, an advocacy group for pit bulls Arab Film Festival, a California nonprofit Armed Forces Foundation, a military non-profit support group Aspies For Freedom, a group advocating autism rights Austin Film Festival, a film festival in Austin, Texas
Science, technology, and mathematics Species affinis, in biological open nomenclature (abbreviated "aff.") , a file format to store disk images and metadata Affine group, , the group of affine transformations on a space Automated Flight Following (AFF), a US Department of Agriculture system to track firefighting aircraft
Other uses Aff (river), in western France Accelerated freefall, a method of skydiving training Adult FriendFinder, a commercial dating website Advanced Fighting Fantasy, a British roleplaying game Advance-fee fraud, a confidence trick A Fine Frenzy, a singer Affluence stop, MTR station code "AFF" United States Air Force Academy Airfield in Colorado Springs, Colorado, US (IATA airport code AFF)