| Domalain | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Coordinates: | 47.9969°N -1.2403°W |
| Insee: | 35097 |
| Postal Code: | 35680 |
| Arrondissement: | Fougères-Vitré |
| Canton: | La Guerche-de-Bretagne |
| Mayor: | Christian Olivier[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Vitré Communauté |
| Elevation Min M: | 45 |
| Elevation Max M: | 108 |
| Area Km2: | 33.54 |
Domalain (pronounced as /fr/; ; Gallo: Domalaen) is a commune in the Ille-et-Vilaine department of Brittany in northwestern France.
Inhabitants of Domalain are called Domalinois in French.