| Availles-sur-Seiche | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Coordinates: | 47.9619°N -1.1947°W |
| Arrondissement: | Fougères-Vitré |
| Canton: | La Guerche-de-Bretagne |
| Insee: | 35008 |
| Postal Code: | 35130 |
| Mayor: | Élizabeth Carré[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Vitré Communauté |
| Elevation M: | 80 |
| Elevation Min M: | 52 |
| Elevation Max M: | 89 |
| Area Km2: | 11.06 |
Availles-sur-Seiche (in French pronounced as /avaj syʁ sɛʃ/; ; Gallo: Avaylh) is a commune in the Ille-et-Vilaine department, in Brittany, in northwestern France.
Inhabitants of Availles-sur-Seiche are called Availlais in French.