| Plerneuf | |
| Native Name: | Plerneg |
| Commune Status: | Commune |
| Coordinates: | 48.5153°N -2.8836°W |
| Insee: | 22188 |
| Postal Code: | 22170 |
| Arrondissement: | Guingamp |
| Canton: | Plélo |
| Mayor: | Philippe Le Méhauté[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Leff Armor Communauté |
| Elevation Min M: | 118 |
| Elevation Max M: | 208 |
| Area Km2: | 8.30 |
Plerneuf (in French pronounced as /plɛʁnœf/; ; Gallo: Plèrnoec) is a commune in the Côtes-d'Armor department of Brittany in northwestern France.
Inhabitants of Plerneuf are called plerneucois in French.