| Teillay | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Teillay (Ille-et-Vilaine).svg |
| Coordinates: | 47.8081°N -1.5369°W |
| Insee: | 35332 |
| Postal Code: | 35620 |
| Arrondissement: | Redon |
| Canton: | Bain-de-Bretagne |
| Mayor: | Yvon Mellet[1] |
| Term: | 2020 - 2026 |
| Elevation Min M: | 37 |
| Elevation Max M: | 98 |
| Area Km2: | 26.21 |
Teillay (in French pronounced as /tɛjɛ/; Breton: Tilheg) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.
The Brutz forms all of the commune's eastern border, then flows into the Semnon, which forms part of its northeastern border.
Inhabitants of Teillay are called Teillacois in French.