| Lourmais | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Coordinates: | 48.4506°N -1.7264°W |
| Insee: | 35159 |
| Postal Code: | 35270 |
| Arrondissement: | Saint-Malo |
| Canton: | Combourg |
| Mayor: | François Bordin[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Bretagne Romantique |
| Elevation Min M: | 60 |
| Elevation Max M: | 111 |
| Area Km2: | 7.22 |
Lourmais (in French pronounced as /luʁmɛ/; Gallo: L’Oumàe, Breton: An Oulmeg) is a commune in the Ille-et-Vilaine department of Brittany in northwestern France.
Inhabitants of Lourmais are called Lourmaisiens in French.