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IFF, Iff or iff can stand for:
- Identification friend or foe - a radio based identification system utilizing transponders
- if and only if - mathematical and logical connector indicating that either both statements are true or both are false
- Interchange File Format - a computer file format introduced in 1985 and later extended into many others
- International Flavors and Fragrances - a company producing flavors and fragrances
- International Freedom Foundation
- Islamic republic of Iran football federation - Iranian national football federation
- International Film Festival
"IFF"