| Ercé-en-Lamée | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Coordinates: | 47.8308°N -1.5578°W |
| Insee: | 35106 |
| Postal Code: | 35620 |
| Arrondissement: | Redon |
| Canton: | Bain-de-Bretagne |
| Mayor: | Isabelle Bertin[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Bretagne Porte de Loire |
| Elevation Min M: | 23 |
| Elevation Max M: | 107 |
| Area Km2: | 39.21 |
Ercé-en-Lamée (in French pronounced as /ɛʁse ɑ̃ lame/, literally Ercé in Lamée; Gallo: Erczaé,) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.
The river Semnon forms all of the commune's northern border.
Inhabitants of Ercé-en-Lamée are called Ercéens in French.