IAC

IAC can mean:

Organizations

* Interstate Arms Corporation, a firearms company specializing in reproductions of repeating shotguns.
* IAC/InterActiveCorp, an American conglomerate.
* Inter-African Committee on Traditional Practices Affecting the Health of Women and Children which raises consciousness about female genital cutting and similar issues
* The International Academy of Cytology, an international organisation of cytologists and professional persons concerned with research in clinical cytology.
* The International Action Center, a leftist organization.
* The International Aerobatic Club, which governs aerobatics in the United States under the regulation of the Fédération Aéronautique Internationale.
* The Instituto de Astrofísica de Canarias, an astrophysical research institute based in the Canary Islands, Spain.
* The Irish Air Corps, the Aviation wing of the Irish Defence Forces.
* International Auctioneer Championship, a yearly contest held by the National Auctioneers Association.
* In Action Crew - Australia
* Industrial Acoustics Company, the world's largest provider of noise and acoustic control products, structures and test facilities.
* IAC - The Film and Video Institute

Technical terms

* Idle Air Controller, a motor-driven valve which controls intake air to maintain idle RPM in internal combustion engines.
* Interactive Activation and Competition, a kind of Neural network.
* International access code, in telecommunications.
* Interapplication Communications, the previous name of Mac OS X's Apple events.
* Interpret As Command, a control character in the Telnet protocol.

Video games and music

* In Amber Clad, a missile frigate in the Halo video game series
* In music, it refers to an imperfect authentic cadence.