| Lanmérin | |
| Native Name: | Lanvilin |
| Commune Status: | Commune |
| Coordinates: | 48.7422°N -3.3483°W |
| Insee: | 22110 |
| Postal Code: | 22300 |
| Arrondissement: | Lannion |
| Canton: | Tréguier |
| Mayor: | Jean-François Saliou[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Lannion-Trégor Communauté |
| Elevation Min M: | 27 |
| Elevation Max M: | 75 |
| Area Km2: | 4.15 |
Lanmérin (in French pronounced as /lɑ̃meʁɛ̃/; Breton: Lanvilin) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.
Inhabitants of Lanmérin are called lanmérinois in French.