TSIF
| Acronym | Definition |
|---|---|
| TSIF | The Sky Is Falling |
| TSIF | Tooth Surface Index of Fluorosis |
| TSIF | TSA (Transportation Security Administration) Systems Integration Facility (US DHS) |
| TSIF | Transport Stream Interface |
| TSIF | Trawsfynydd Strategic Integrated Framework (nuclear decommissioning project) |
| TSIF | Thank Science It's Friday |
| TSIF | Trichotillomania Support Information and Friends (Pittsburgh, PA) |
| TSIF | This Space Intentionally Filled |