| Plussulien | |
| Native Name: | Plusulian |
| Commune Status: | Commune |
| Coordinates: | 48.2836°N -3.0692°W |
| Insee: | 22244 |
| Postal Code: | 22320 |
| Arrondissement: | Saint-Brieuc |
| Canton: | Guerlédan |
| Mayor: | Gilles Thomas[1] |
| Term: | 2020 - 2026 |
| Elevation Min M: | 152 |
| Elevation Max M: | 305 |
| Area Km2: | 22.49 |
Plussulien (in French pronounced as /plysyljɛ̃/;) is a commune in the Côtes-d'Armor department of Brittany in northwestern France. It is home to the archeological site of Quelfénnec.
Inhabitants of Plussulien are called plussulianais in French.