| 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 |