| Acronym | Definition |
|---|
| TSAR | The Sun Also Rises |
| TSAR | Tissue Sensing Adaptive Radar (tumor detection) |
| TSAR | Text Search and Replace |
| TSAR | Transportation Statistics Annual Report |
| TSAR | Taiwan Surveillance of Antimicrobial Resistance |
| TSAR | Total Sum at Risk |
| TSAR | Tidewater Search and Rescue (Norfolk, VA) |
| TSAR | Tu Sers A Rien (French: you are useless) |
| TSAR | Topical Safety Analysis Report |
| TSAR | Theater Simulation of Airbase Resources (Model) |
| TSAR | Transportation Security Administration Representative |
| TSAR | Transmission Security Analysis Report |
| TSAR | Test Schedule and Review |
| TSAR | Theater Simulation of Airfield Resources |
| TSAR | TRANSCOM Siting And Readiness |
| TSAR | Time Scanned Array Radar |
| TSAR | Technical Safety Analysis Report (US Department of Energy) |
| TSAR | Time Series Acoustic Recall |
| TSAR | Total System Acknowledgement Responsibility |
| TSAR | Training Situation Analysis Report |
| TSAR | Texas Stairs and Rails (Houston, TX) |
| TSAR | Tactical Situational Awareness Relay |