OTSR
| Acronym | Definition |
|---|---|
| OTSR | Obrazkowy Test Slownikowy - Rozumienie (Polish: Visual Dictionary Test - Understanding; psychometric tool) |
| OTSR | Optimum Track Ship Routing |
| OTSR | Over The Shoulder Restraints (amusement rides) |
| OTSR | Omni Transmit Sector Receive |
| OTSR | Office of Transportation Security Redress (US Transportation Security Administration) |
| OTSR | Other Than Selected Reserve (US Air Force) |
| OTSR | Ornamental Transplant Soil and Root inoculants (mycorrhizae inoculants for horticultural use) |