TAC, or tac, may refer to: People Pablo Tac, US scholar Pham Cong Tac, a leader of the Cao Dai religion Places Tác, a village in Fejér County, Hungary Organisations TAC (building automation), a Swedish building automation company Tactical Air Command, a former command of the US Air Force Technical Advisory Council, a committee advising the US FCC Technical Assistance Center, a company's internal support group for external customers The Aleut Corporation, Alaska, United States, a Native Regional Corporation The Analysis Corporation, a private intelligence firm The Ant Commandos, a company which produces video game console peripherals The Asatru Community, an inclusive Norse Pagan/Heathen sect; see Kindred (Heathenism) The Athletics Congress, US sports governing body, became USATF in 1992 The Architects Collaborative, Cambridge, Massachusetts, US Thomas Aquinas College, a college with multiple campuses in the US Treatment Action Campaign, a South African AIDS organisation Treaty of Amity and Cooperation in Southeast Asia Traditional Anglican Communion Transatlantic Council, Boy Scouts of America Transport TAC Colombia, a charter airline based in Bogotá, Colombia TAC, the IATA code for Daniel Z. Romualdez Airport on Leyte island, Philippines TAC, the National Rail code for Tackley railway station in the county of Oxfordshire, UK TAC - Transportes Aéreos Catarinense, a former Brazilian airline Tecnologia Automotiva Catarinense (TAC) a Brazilian automotive company Terminal area chart, an aeronautical chart of the area surrounding a major airport Thai Airways Company, a former Thai airline Trans Air Congo, a Congolese airline Transport Accident Commission, an insurer in Victoria, Australia Military and law enforcement Demro TAC-1, a pistol calibre carbine/submachine gun McMillan TAC-50, an American sniper rifle Tactical Air Command, a former major command of the United States Air Force TAC 30, the official name of a SWAT unit belonging to the King County Sheriff's Office Science and technology TAC, a codon for the amino acid Tyrosine TAC, a mixture of tetracaine, adrenaline and cocaine, a liquid sometimes given as a soothing gel to children TaC, chemical formula for Tantalum carbide tac, a Linux command that concatenates lines in reverse, named by analogy with cat TAC (software), an instant messaging and chat client program TAC-2, game controller compatible with Atari 2600 video game systems Terminal Access Controller, a host computer that accepts terminal connections Thermally Advantaged Chassis, an Intel computer specification Three-address code, a representation of intermediate code used by compilers Time-activity curve, tracer concentration within a region of interest