TDSI
| Acronym | Definition |
|---|---|
| TDSI | Tag Data Security Infrastructure |
| TDSI | Toronto Dominion Securities, Inc. (Toronto, CA) |
| TDSI | Temasek Defence Systems Institute (est. 2001) |
| TDSI | Transport Development and Strategy Institute (Vietnam) |
| TDSI | Tax Deduction Scheme for Interest (UK) |
| TDSI | The Design Studio Inc. (Wyoming) |
| TDSI | Tolerable Daily Soil Intake |