IFF

IFF, Iff or iff may refer to:

Avionics

• Identification friend or foe, an identification system designed to identify aircraft, vehicles or forces as friendly.

Art, entertainment, and media

• Iff of the Unpronounceable Name, a minor character in Patricia A. McKillip's Riddle-Master trilogy

Enterprises

• International Flavors & Fragrances, a company producing flavors and fragrances

Mathematics, science, and technology

• Identification friend or foe, an electronic radio-based identification system
• If and only if, a mathematical and logical connector indicating that 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
• Interchange File Format, a computer file format

Organisations

• International Institute of Forecasters
• Institute For Figuring, an organization that promotes the public understanding of the poetic and aesthetic dimensions of science, mathematics and the technical arts
• International Freedom Foundation

Sports organisations

• International Fencing Federation (Fédération Internationale d'Escrime), 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

Transport

• Iff card, a smart card used on bus services in Cardiff, Wales, United Kingdom

Other uses

• Fakultät für Interdisziplinäre Forschung und Fortbildung (Faculty for Interdisciplinary Research and Continuing Education), a faculty of the Austrian University of Klagenfurt
• International Finance Facility
• International freight forwarder, an individual or company that books or otherwise arranges space for shipments between countries via common carriers