| Acronym | Definition |
|---|
| SDT | Soldat |
| SDT | Sigma Delta Tau (sorority) |
| SDT | Signal Detection Theory (cognitive science) |
| SDT | Service Description Table (Digital Video Broadcast data) |
| SDT | Specially Designated Terrorist |
| SDT | Subpoena Duces Tecum |
| SDT | Science Definition Team (NASA) |
| SDT | Second Destination Transportation |
| SDT | Step Down Transformer |
| SDT | Society of Dairy Technology (UK) |
| SDT | San Diego Trolley |
| SdT | Service de Traduction (Translation Service of the Commission of the EU) |
| SDT | Stutter Dial Tone |
| SDT | Software Development Tool |
| SDT | Self Development Test |
| SDT | Shock-to-Detonation Transition (detonation physics) |
| SDT | Self Directed Teams |
| SDT | Scheduled Downtime |
| SDT | Sol Driven Train (band) |
| SDT | System Design Team |
| SDT | Software Development Test |
| SDT | Start Data Transfer |
| SDT | Secondary Designated Target |
| SDT | Systems Development Team |
| SDT | Senior Director Technician |
| SDT | Silver Diffusion Transfer (film processing) |
| SDT | Selection Diversity Transmission |
| SDT | Space & Defence Technologies (Turkey) |
| SDT | SACCS Desktop Terminal |
| SDT | Steered Directional Transmission |
| SDT | Simple Data Transformer |
| SDT | Spatial Display Tool |
| SDT | System Diagnostic Test |
| SDT | Spare Delivery Time |
| SDT | Standard Diagnostic Test |
| SDT | Shadow Development Technologies |
| SDT | Small Dead Time (geophysics) |
| SDT | Standard Duty Title |
| SDT | Supply Delay Time |
| SDT | System Development Test |
| SDT | Synchronization, Data and Timing (composite data signal) |
| SDT | Shippers Declaration of Transport of dangerous goods (FIATA) |
| SDT | Sun-Dried Tomato(es) (restaurant menus) |
| SDT | Surveillance Data Translator |
| SDT | Self-Determination Theory (psychology) |
| SDT | Second Dial Tone |
| SDT | Serial Data Transmitter |