TSEI
| Acronym | Definition |
|---|---|
| TSEI | Transportation Safety Equipment Institute |
| TSEI | Team Sports Entertainment Inc. (now Idea Sports Entertainment Group, Inc.) |
| TSEI | Total Skin Electron Irradiation |
| TSEI | Total Sports & Entertainment India Pvt. Ltd. |
| TSEI | Truck Safety Equipment Institute |
| TSEI | Technical Support Engineer I (job title) |