TTT or Triple T may refer to:
Science Time-temperature transformation, a plot of temperature versus time; see Isothermal transformation diagram Tangled Type Theory, an extension of Typed Set Theory; see New Foundations Phenylalanine, an amino acid with the codon TTT Tilt table test, a medical test for dysautonomia and/or syncope
Arts, entertainment, and media Films The Lord of the Rings: The Two Towers, 2002, adaptation of the Tolkien novel Thalaivar Thambi Thalaimaiyil, a 2026 Indian Tamil-language political satire film
Television Tinga Tinga Tales, a television cartoon series about animals The Green Death. a 1973 Doctor Who serial (production code TTT) Talk TV (Philippine TV network), an English-language news and talk television network in the Philippines Trinidad and Tobago Television, a television network in Trinidad and Tobago
Books The Two Towers, the second volume of J. R. R. Tolkien's novel The Lord of the Rings (1954) Tres tristes tigres (novel), 1967, by Guillermo Cabrera Infante
Games Tic-tac-toe Tekken Tag Tournament, the fourth installment of the Tekken fighting game series Trouble in Terrorist Town, a game mode for Garry's Mod
Music Triple Trip Touch, a free-jazz band
Businesses and organisations Thalir Thiran Thittam, a life skills education program in India TT Technologies, a construction equipment manufacturer Taupo Totara Timber Company, a former timber company in New Zealand Taupo Totara Timber Railway, a former railway in New Zealand built by the Taupo Totara Timber Company
Other uses Taitung Airport, IATA code TTT Team time trial, a bicycle racing event "Triple T", a former name of the Sea FM radio station Morse code prefix for messages announcing safety warnings, equivalent of Sécurité Tung Tung Tung Sahur, an AI-generated fictional Internet meme character often abbreviated as "Triple T"
See also TT (disambiguation) 3T (disambiguation) T3 (disambiguation)