| Thetis | |
| Native Name: | Θέτις |
| Native Name Lang: | el |
| Coordinates: | 34.9536°N 25.1572°W |
| Archipelago: | Cretan Islands |
| Country: | Greece |
| Country Admin Divisions Title: | Region |
| Country Admin Divisions: | Crete |
| Country Admin Divisions Title 1: | Regional unit |
| Country Admin Divisions 1: | Heraklion |
| Country Admin Divisions Title 2: | Municipality |
Thetis (Greek, Modern (1453-);: Θέτις) is a small islet off the southern coast of the Greek island of Crete in the Libyan Sea. The islet is administered from Asterousia in Heraklion regional unit.