| Acronym | Definition |
|---|
| CTSD | Clinical Trials Signal Detection (clinical research) |
| CTSD | Countdown to Signing Day (sports) |
| CTSD | Crew and Thermal Systems Division |
| CTSD | Churches Together in Spalding and District (UK) |
| CTSD | Certified Trading System Developer |
| CTSD | Computer Test Sequences Document (NASA) |
| CTSD | Coordinate Transformation System (NASA) |
| CTSD | Combat Training Support Directorate |
| CTSD | Chiyoda Toyo Sakhalin Development |
| CTSD | Certified Technology Specialist - Design (International Communications Industries Association certification) |