| Mérillac | |
| Native Name: | Merelieg |
| Commune Status: | Commune |
| Coordinates: | 48.2567°N -2.3931°W |
| Insee: | 22148 |
| Postal Code: | 22230 |
| Arrondissement: | Saint-Brieuc |
| Canton: | Broons |
| Mayor: | Claude Delahaye[1] |
| Term: | 2020 - 2026 |
| Elevation Min M: | 108 |
| Elevation Max M: | 188 |
| Area Km2: | 13.86 |
Mérillac (in French pronounced as /meʁijak/; Breton: Merelieg) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.
The Meu forms part of the commune's southern border.
The Rance forms part of the commune's western border, flows east-southeast through the middle of the commune, then forms most of its southeastern border.
Inhabitants of Mérillac are called mérillaciens in French.