CTT may refer to:
- CTT Correios de Portugal, S.A., the national postal service of Portugal
- CTT (Macau), the Macau Post Office
- Cycling Time Trials, the governing body for time trialling in the UK
- Classical test theory
- Columbia TriStar Television
- ConcurTaskTrees
- Custom Air Transport's ICAO code
- CTT, a specialty certification of Comp TIA
- CTT, a codon for the amino acid Leucine
- × Cattlianthe (Ctt.), a nothogenus of orchids
This disambiguation page lists articles associated with the title CTT.
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