| Acronym | Definition |
|---|
| TDT | Televisión Digital Terrestre (digital television type, Spain) |
| TDT | Temple Daily Telegram (newspaper) |
| TDT | Terminal Deoxynucleotidyl Transferase (biochemistry) |
| TDT | transmission disequilibrium test |
| TDT | Topic Detection and Tracking (datamining) |
| TDT | Terrestrial Dynamical Time (obsolete form of TT) |
| TDT | Turbo Diesel Touring |
| TDT | Transaction Dump Table |
| TDT | Terrestrial Digital Television |
| TDT | Tourist Development Tax |
| TDT | Tucker-Davis Technologies (Alachua, FL) |
| TDT | Toronto Dance Theatre |
| TDT | Tag Data Translation |
| TDT | Time Domain Transmission |
| TDT | Training Development Team (various organizations) |
| TDT | Tasmanian Digital Television (Australia) |
| TDT | Transonic Dynamics Tunnel |
| TDT | Thermal Decay Time |
| TDT | The Domino Theory (band) |
| TDT | Tredegar Development Trust (UK) |
| TDT | Theater Display Terminal |
| TDT | Transparent Digital Transmodulator (telecommunications) |
| TDT | Total Decompression Time |
| TDT | Test Data Team |
| TDT | Target Designator Transmitter |
| TDT | Tentative Discharge Tomorrow |
| TDT | Tactical Display Terminal |
| TDT | Training Development Technician |
| TDT | Timing with Dirty Templates Algorithm |