| Tinténiac | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Tinténiac (Ille-et-Vilaine).svg |
| Coordinates: | 48.3297°N -1.8336°W |
| Insee: | 35337 |
| Postal Code: | 35190 |
| Arrondissement: | Saint-Malo |
| Canton: | Combourg |
| Mayor: | Christian Toczé[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Bretagne Romantique |
| Elevation Min M: | 31 |
| Elevation Max M: | 90 |
| Area Km2: | 23.40 |
Tinténiac (in French pronounced as /tɛ̃tenjak/; Breton: Tintenieg; Gallo: Teintenyac) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.
Inhabitants of Tinténiac are called Tinténiacais in French.