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 Mathematics, science, and technology 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 Organizations 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 Sports organizations 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 Other uses Illicit financial flows, a concept in economics and finance related to resources that are of illegal origin, use or transfer 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 See also If (disambiguation) IIF (disambiguation)