TMT may refer to:
- In transport
- Thane Municipal Transport, a bus operator in Thane, India
- Tubular Modular Track for railways
- IATA airport code TMT: Porto Trombetas Airport, Pará, Brazil
- Software
- TotalMedia Theatre
- The Market Tomorrow, software that predicts open price, close price, high and low for listed companies in major stock markets
- Topic Modeling Toolbox of Stanford University, software to use Latent Dirichlet Allocation
- Other
- Thulladha Manamum Thullum, a 1999 Tamil romantic film
- Tandem mass tag, a label used for quantitative mass spectrometry–based proteomics
- Tarsometatarsal articulations
- Technology, media, telecommunications as an industry sector
- Teratoma, with malignant transformation
- Terror management theory
- Thermo-mechanical treatment of steel used for reinforcement bars in civil constructions
- Thirty Meter Telescope
- Thousand metric tonnes
- Timothy Ministry Team, a bible school in South Africa
- Tiny Mix Tapes
- Top Management Team
- Trick My Truck
- Trimethylthiazoline, a component of fox urine causing innate fear response in rodents
- Turkish Resistance Organization (Turkish: Türk Mukavemet Teşkilatı)
- Turkmenistani manat, the currency of Turkmenistan