IFF, Iff or iff can stand for:
- if and only if, a mathematical and logical connector indicating that either both statements are true or both are false
- Identification friend or foe, an electronic radio based identification system utilizing transponders
- In Flanders Fields Museum, a World War I museum located in Ypres, Belgium
- Interchange File Format, a computer file format introduced in 1985 and later extended into many others
- International Fashion Federation
- International Floorball Federation, the global governing body for the sport of floorball
- International Flavors and Fragrances, a company producing flavors and fragrances
- International Freedom Foundation
- International Film Festival
- International Finance Facility
- Introduction to Fighter Fundamentals, a U.S. Air Force formal training course for new fighter pilots
- Islamic Republic of Iran Football Federation, the Iran Football Federation
- International Freedom Fighters, an American Army gaming clan
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