| Noyal-Châtillon-sur-Seiche | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Châtillon-sur-Seiche (Ille-et-Vilaine).svg |
| Coordinates: | 48.0442°N -1.6564°W |
| Insee: | 35206 |
| Postal Code: | 35230 |
| Arrondissement: | Rennes |
| Canton: | Bruz |
| Mayor: | Sébastien Guéret[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Rennes Métropole |
| Elevation Min M: | 17 |
| Elevation Max M: | 54 |
| Area Km2: | 26.51 |
Noyal-Châtillon-sur-Seiche (in French pronounced as /nwajal ʃatijɔ̃ syʁ sɛʃ/; Gallo: Nóyau-Chastilhon,) is a commune in the Ille-et-Vilaine department of Brittany in northwestern France.
Inhabitants of Noyal-Châtillon-sur-Seiche are called in French castelnodais.