| Lanfains | |
| Native Name: | Lanfeun |
| Commune Status: | Commune |
| Coordinates: | 48.3539°N -2.9128°W |
| Insee: | 22099 |
| Postal Code: | 22800 |
| Arrondissement: | Saint-Brieuc |
| Canton: | Plélo |
| Mayor: | Gérard Mérot[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Saint-Brieuc Armor |
| Elevation Min M: | 147 |
| Elevation Max M: | 322 |
| Area Km2: | 21.87 |
Lanfains (in French pronounced as /lɑ̃fɛ̃/; Breton: Lanfeun) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.
Inhabitants of Lanfains are called lanfinois in French.
The Lanfains countryside is bocage with undulating relief (Armorican Massif).
The highest point in the commune at 323 m is situated at Bel Air-Porpaire. This makes Lanfains one of the highest communes in Brittany, the church standing at an altitude of 310 m.
The neighbouring communes are Saint-Brandan, L'Hermitage-Lorge, Le Bodéo, La Harmoye, Saint-Bihy and Le Fœil. Quintin, Allineuc and Corlay are a few kilometres away.
Lanfains' name comes from the Breton language "lann" (hermitage) and, it seems, from the Latin "fanum" (temple). Lanfains was situated at the border of the Gallo and Breton languages.
The parish of Lanfains was first mentioned in 1428.
A wind farm was installed in the commune in 2005.
Agriculture is the main economic activity of the commune. It is essentially geared to husbandry of cattle, poultry and pigs and polyculture. The area of the commune is hectares. Two food industry enterprises are present, the LDC abattoir and the Armoricaine dairy. Artisan work is represented by a roofer, a plumber, a sawmill, a fish farmer and a milk factory. There are several commercial firms in the commune including a café and bar, a crêperie, a garage, a public works firm and a poultry transporter.