TAC

TAC may refer to:

* Tác, Hungary
* Pablo Tac, a Luiseño Indian who provided a rare contemporary Native American perspective on the institutions and early history of California
* Pham Cong Tac, the Pope of the Cao Dai Sect that battled against Ngo Dinh Diem in control of South Vietnam
* Tarsus American College
* Thomas Aquinas College

In transportation:
* TAC Colombia, a charter airline based at El Dorado International Airport in Bogotá, Colombia
* Terminal area chart, an aeronautical chart intended for navigation under Visual Flight Rules that depict areas surrounding major airports
* Transport Accident Commission, the statutory insurer of third-party personal liablility for transport accidents in Victoria, Australia
* Trenau Arriva Cymru, Welsh for Arriva Trains Wales

In military:
* .408 Chey Tac, a rifle cartridge that was developed by Dr. John D. Taylor with the assistance of machinist William O. Wordman
* McMillan TAC-50, a military/law enforcement sniper rifle chambered in .50 BMG
* Tactical Air Command, a former command of the United States Air Force charged with battlefield-level air combat
* Tactical Autonomous Combatant, a robotic soldier that will eventually replace a human combatant in a battlefield

In technology:
* [http://www.feelreality.com/top_affiliate_challenge/ Top Affiliate Challenge] Internet Reality TV Show
* Group TAC, a Japanese anime and computer graphics studio located in Shibuya, Tokyo
* TAC (software), an open source instant messaging and chat client program written by AOL
* Terminal Access Controller, a host computer that accepts terminal connections
* The Texas Armoring Corporation, a company who install bulletproofing in civilian vehicles.
* Thermally Advantaged Chassis, an Intel specification for improved computer cooling when using an Intel Pentium 4, Pentium D, or Celeron D
* Three address code, a representation of intermediate code used by compilers
* Type Allocation Code, a portion of a mobile device's IMEI code used to identify the manufacturer and model
* Triacetyl cellulose, a polymer, usually in film form, used in various display applications
* Technical Assistance Center, a company's internal support group for external customers
* TAC, a Swedish-based building automation company originally established in 1925. Owned by Schneider Electric

In other fields:
* Traditional Anglican Communion
* Tartu Aviation College, a school for aviation professionals in Estonia
* Technical Advisory Committee, of the Florida Building Commission, http://www.floridabuilding.org/BCISOld/bc/bc_comm_srch.asp
* Technical Advisory Council, a federal advisory committee of the Federal Communications Commission
* The Aleut Corporation, an Alaska Native Regional Corporation created under the Alaska Native Claims Settlement Act of 1971.
* The Architects Collaborative, a Cambridge, MA, firm following the teachings of Walter Gropius
* Total Allowable Catch, a commercial fishing regulation to limit the maximum catch of a specific fish species within an area
* Traffic Acquisition Costs, a term for revenue generated through purchased internet traffic, like bidding on key search words.
* Treatment Action Campaign, a South African grassroots pressure group which was founded by Zackie Achmat
* Tomografia Assiale Computerizzata, an Italian industrial group
* Triangle Aquatic Center

In gaming:

* TAC-2, an Atari 2600 compatible game controller
* The Ant Commandos, a company which produces video game console peripherals