TCL or Tcl or TCLs may refer to:

Business

* TCL Technology, a Chinese consumer electronics and appliance company **TCL Electronics, a subsidiary of TCL Technology * Texas Collegiate League, a collegiate baseball league * Trade Centre Limited, a Crown corporation in Nova Scotia

Computing

* The Common Link, a KOMpatible bulletin board system for MS-DOS * Transform, clipping, and lighting, a feature of 3D graphics cards * tCL, CAS latency in RAM timings

Software

* Tcl (Tool Command Language), a computer programming language * Terminal Control Language, used to program Verifone devices * Tiny Core Linux, a minimal Linux operating system * Tymshare Conversational Language, a former experimental interactive language * Transaction Control Language, a family of computer languages used by database systems to control transactions * Think Class Library, a class library for Macintosh featured in THINK C

Education

* Theological College of Lanka, a theological college in Sri Lanka *Trinity College London, the international examination board * People's Libraries Society ('), a former educational society in the Prussian partition of Poland * Transnational College of Lex, a language research institution based in Japan

Science

* TCL (GTPase), in biochemistry. * Tibial collateral ligament, one of the four major ligaments of the knee. * Thermostatically controlled load (TCL)

Transportation

* Transports en commun lyonnais, the public transport system in Lyon, France * Tung Chung line, one of the MTR lines in Hong Kong * Tuscaloosa National Airport (IATA code), US *Twin City Lines, a former public transit via streetcar in Minneapolis, US {{Disambiguation