OTSI
| Acronym | Definition |
|---|---|
| OTSI | Online Training Solutions, Inc. (Bellevue, WA) |
| OTSI | Object Technology Solutions Inc. (various locations) |
| OTSI | Office of Transport Safety Investigation (New South Wales, Australia) |
| OTSI | Optimum Transsource, Incorporated (Baguio City, Philippines transcription company) |