| Cohiniac | |
| Native Name: | Kaouennieg |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason de la ville de Cohiniac (Côtes-d'Armor).svg |
| Coordinates: | 48.4616°N -2.9475°W |
| Insee: | 22045 |
| Postal Code: | 22800 |
| Arrondissement: | Guingamp |
| Canton: | Plélo |
| Mayor: | Jean-Paul Héder[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Leff Armor Communauté |
| Elevation Min M: | 139 |
| Elevation Max M: | 246 |
| Area Km2: | 12.26 |
Cohiniac (in French pronounced as /kɔinjak/; ; Gallo: Coheinyac) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.
Inhabitants of Cohiniac are called Cohiniacais in French.