ITT may refer to:
Communication edit
- Infantry-Tank Telephone, a device allowing infantrymen to speak to the occupants of armoured vehicles.
Mathematics edit
- Intuitionistic type theory, other name of Martin-Löf Type Theory
- Intensional type theory
Business edit
- ITT Inc. (formerly International Telephone & Telegraph), US
- Invitation to tender for a contract
- ITT Semiconductors
Education edit
- ITT Technical Institute, US
- Former Institute of Technology, Tallaght, Dublin, Ireland
- Institute of Technology, Tralee, Ireland
Media edit
- Cousin Itt, of the fictional Addams Family
- "I.T.T (International Thief Thief)", a political screed about ITT Corp. by Fela Kuti
Medicine edit
Sport edit
- Individual time trial in bicycle racing