IFF

IFF, Iff or iff may refer to:

Arts and entertainment

Simon Iff, a fictional character by Aleister Crowley
Iff of the Unpronounceable Name, a fictional character in the Riddle-Master trilogy by Patricia A. McKillip
"IFF", an episode of The Expanse

Identification friend or foe, an electronic radio-based identification system
If and only if, a biconditional logical connective between statements, where either both statements are true or both are false
IFF (software), a series of compositing and visual effects applications (Inferno, Flame and Flint) made by Autodesk Media and Entertainment
Iff card, a smart card used on bus services in Cardiff, Wales, United Kingdom
Interchange File Format, a computer file format

Institute For Figuring, an organization that promotes the public understanding of the poetic and aesthetic dimensions of science, mathematics and the technical arts
International Federation of Factory Workers, former trade union international
International Flavors & Fragrances, an American corporation which produces flavors and fragrances
International Freedom Foundation, a self-described anti-communist group established in Washington, D.C.
Iff Books, an imprint of John Hunt Publishing

International Fencing Federation (Fédération Internationale d'Escrime or FIE), the international governing body for fencing
International Floorball Federation, the global governing body for the sport of floorball
Irish Fencing Federation, the governing body for fencing in Ireland

Fakultät für Interdisziplinäre Forschung und Fortbildung (Faculty for Interdisciplinary Research and Continuing Education), a faculty of the Austrian University of Klagenfurt
Indonesian Film Festival, an annual awards ceremony organised by the Indonesian Film Board to celebrate cinematic achievements in the Indonesian film industry
International Finance Facility, proposed by HM Treasury in conjunction with the Department for International Development of the United Kingdom
International freight forwarder, an individual or company that books or otherwise arranges space for shipments between countries via common carriers