TAC
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 within dynamic image plotted over time
Triacetyl cellulose, a polymer used in display applications
Trigeminal autonomic cephalgia, a type of headache that occurs on one side of the head
Type Allocation Code, part of a mobile device's IMEI identifying maker and model

Media
Group TAC, a Japanese anime and computer graphics studio
The Accessible Channel, a Canadian digital television channel
The American Conservative, a paleoconservative magazine published by the American Ideas Institute

Other
tac, the ISO 639-3 code for the Tarahumara language spoken in the state of Chihuahua, Mexico
Terrible-Monster Attacking Crew, a fictional pilot squadron in Ultraman AceThe Arts Centre or TAC, former name of Home of the Arts, Gold Coast
Total allowable catch, in commercial fishing under the European Union's Common Fisheries Policy

See also
All pages with titles containing TAC
All pages with titles beginning with TAC
All pages with titles beginning with Tac