| Acronym | Definition |
|---|
| ATTT➣And That's the Truth (Internet slang) |
| ATTT➣Advanced Technology Tactical Transport (aircraft; US DoD) |
| ATTT➣Association of Tourism Teachers and Trainers |
| ATTT➣Association of Tanzania Tobacco Traders |
| ATTT➣Associazione Ticinese Tennis Tavolo (Italian: Ticino Table Tennis Association; Ticino, Switzerland) |
| ATTT➣American Telephone and Telegraph Technologies, Inc. |