| Rouillac | |
| Native Name: | Rioleg |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason de la ville de Rouillac (Côtes-d'Armor).svg |
| Coordinates: | 48.31°N -2.3647°W |
| Insee: | 22267 |
| Postal Code: | 22250 |
| Arrondissement: | Saint-Brieuc |
| Canton: | Broons |
| Mayor: | Jean-Luc Couëllan[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Lamballe Terre et Mer |
| Elevation Min M: | 81 |
| Elevation Max M: | 187 |
| Area Km2: | 15.77 |
Rouillac (in French pronounced as /ʁujak/;) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.
Inhabitants of Rouillac are called rouillacais in French.