TCL may mean:

• Computer languages
  • Tcl (Tool Command Language), a computer programming language
  • TCL (GTPase)
  • Terminal Control Language, used to program VeriFone devices
  • Terminal Control Language, a Pick operating system command language
  • Trader Constraint Language, part of the CORBA Notification Service
  • Transaction Control Language, a family of computer languages used by database systems to control transactions.
  • The Common Link, a KOMpatible Bulletin board system for MS-DOS

• Organizations
  • Texas Collegiate League, a collegiate baseball league
  • Trinity College Library, Dublin, the largest library in Ireland
  • Towarzystwo Czytelni Ludowych (1880–1939) or People's Libraries Society
  • Transports en commun lyonnais, the Lyon public transport system.

• Businesses
  • Twin City Lines, former public transit via streetcar in Minneapolis
  • TCL Corporation, a Chinese electronics manufacturer

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