| 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 |