| Langast | |
| Native Name: | Lanwal |
| Coordinates: | 48.2808°N -2.6625°W |
| Insee: | 22100 |
| Postal Code: | 22150 |
| Arrondissement: | Saint-Brieuc |
| Canton: | Guerlédan |
| Commune: | Plouguenast-Langast |
| Elevation Min M: | 104 |
| Elevation Max M: | 240 |
| Area Km2: | 20.45 |
| Population: | 577 |
| Population Date: | 2019 |
| Population Footnotes: | [1] |
Langast (pronounced as /fr/; br|Lanwal; Gallo: Langau) is a former commune in the Côtes-d'Armor department of Brittany in northwestern France. On 1 January 2019, it was merged into the new commune Plouguenast-Langast.[2]
Inhabitants of Langast are called langastiens or langastais in French.