| trettioett | thirty-one |
| trettiofem | thirty-five |
| trettiofyra | thirty-four |
| trettionde | thirtieth |
| trettionio | thirty-nine |
| trettiosex | thirty-six |
| trettiosju | thirty-seven |
| trettiotre | thirty-three |
| trettiotvå | thirty-two |
| Trettioåriga kriget | Thirty Years' War |
| trettioåtta | thirty-eight |
| tretton | thirteen |
| Tretton dagar | Thirteen Days |
| tretton stycken | baker's dozen |
| trettondag | Epiphany |
| trettondagen | Twelfth Day |
| trettondagsafton | Twelfth Night |
| trettonde | thirteenth |
| Trettondedag jul | Epiphany |
| Trettondedagen | Epiphany |
| Tretåig hackspett | Eurasian Three-toed Woodpecker |
| tretåig mås | kittiwake |
| treudd | trident |
| Treuhandanstalt | Treuhand |
| treva | feel |
| treva efter | grope for |
| trevande | tentative |
| Trevfotingar | Protura |
| Treviso | Treviso |
| trevlig | pleasant |
| trevlig resa | bon voyage |
| trevligare | nicer |
