TCB
TCB may refer to:

Companies and organizations
Taiwan Cooperative Bank, a bank of Taiwan
The Conference Board, a non-profit business membership and research group organization in New York City
Touring Club Belgium, a motoring organization in Belgium
Transportes Charter do Brasil, a cargo airline in São Paulo, Brazil

Computing
Task Control Block, an instance of a process control block within IBM OS/360 and successor systems
Thread control block, a data structure in the operating system kernel
Trusted computing base, a set of computer components critical to its security
Temenos Core Banking, banking software from Temenos Group
Transmission Control Block, a data structure used by a Transmission Control Protocol stack

Music
TCB (album), James Reyne's album of Elvis Presley cover songs
TCB (band), an early 1970s Canadian rock group
TCB Band, rhythm section of Elvis Presley's band

Science
TCB-2, a hallucinogenic phenethylamine compound
Trichlorobenzene, an organic chemical
Temps-Coordonnée Barycentrique (Barycentric Coordinate Time), a coordinate time standard in astronomy
TCB meter (transcutaneous bilirubin meter), a device which measures bilirubin level

Other
TCB (TV program), 1968 Motown television special and album
TCB, IATA code for Treasure Cay Airport in The Bahamas
TCB, NYSE symbol for TCF Financial Corporation
TCB, Ordnance Survey map code for a telephone call box
TCB spline ("tension, continuity, and bias"), in mathematics, another term for a Kochanek–Bartels spline
Telecommunication Certification Body, compliance agency re Federal Communications Commission (FCC) rules and regulations
Track circuit block, name used in the United Kingdom for automatic block signalling on railways

See also
Taking Care of Business (disambiguation)
Telephone Company Building (disambiguation)