DTT is may refer to:
- Degroote Trucks & Trailers, one of the largest European Used Trucks Dealers seated in Belgium
- Double taxation treaty
- Digital terrestrial television, an implementation of digital technology to provide a greater number of channels and/or better quality of picture and sound through a conventional antenna (or aerial) instead of a satellite dish or cable connection
- Deloitte Touche Tohmatsu, one of the largest professional services firms in the world
- Dithiothreitol, the common name for a small-molecule redox reagent known as Cleland's reagent
- The airport code for all airports in the Detroit metro area (Detroit Metropolitan Wayne County Airport, etc.)
- Tarik Farhat
