BTSI
| Acronym | Definition |
|---|---|
| BTSI | Brake Transmission Shift Interlock (automotive) |
| BTSI | Broadcast Technical Services, Inc. (various locations) |
| BTSI | Bryant Trailer Services Inc. (Brampton, Ontario, Canada) |
| BTSI | Biblical and Theological Studies Index |
| BTSI | Bio-Tracking Security, Inc. (Montreal, Quebec, Canada) |
| BTSI | Bio-Tech Systems, Inc. (Las Vegas, NV) |