TCG may refer to:
Businesses and organisations Taipei City Government, Taiwan TCG (company), U.S. investment advisory firm TCGPlayer, an online trading card service Teleport Communications Group, defunct U.S. telephone company Theatre Communications Group, New York non-profit Thomas Cook Group, defunct travel agency and airline Tongan Crip Gang, street gang in North America and Australasia Trusted Computing Group, commercial consortium on technological protection measures Tunisian Combat Group, Islamist insurgents' network
Other uses Geocentric Coordinate Time () Test call generator, in telecommunications TCG (album), 2007 album from The Cheetah Girls Trading card game, collectible form of game Türkiye Cumhuriyeti Gemisi, ship prefix for Ship of the Turkish Republic The genetic code for the amino acid Serine, according to the DNA codon table IATA code for Tacheng Airport, China Tiny Code Generator, interpreter/translator engine of QEMU