OTSA
| Acronym | Definition |
|---|---|
| OTSA | Oklahoma Tribal Statistical Area (Census Bureau geographic area for Oklahoma tribes formerly having a reservation) |
| OTSA | Office of Tax Shelter Analysis (IRS) |
| OTSA | Overseas Trade Show Agencies Ltd. (sales and marketing company) |
| OTSA | OPTEC Threat Support Activity |
| OTSA | Occupational Therapy South Australia (Walkerville, South Australia, Australia) |
| OTSA | Optical Storage Technology Association |