TTIS
| Acronym | Definition |
|---|---|
| TTIS | Total Time in Service |
| TTIS | Travel and Transport Information Service |
| TTIS | The Telegraph in Schools (Indian student newspaper) |
| TTIS | Take Two Interactive Software, Inc. |
| TTIS | Teens Teaching Internet Skills (4-H) |
| TTIS | Transformed Tile Iteration Space |