| Saint-Pierre-de-Plesguen | |
| Native Name: | Sant-Pêr-Plewenn |
| Image Coat Of Arms: | Blason ville fr Saint-Pierre-de-Plesguen (Ille-et-Vilaine).svg |
| Coordinates: | 48.4478°N -1.9119°W |
| Arrondissement: | Saint-Malo |
| Canton: | Combourg |
| Insee: | 35308 |
| Postal Code: | 35720 |
| Commune: | Mesnil-Roc'h |
| Elevation M: | 82 |
| Elevation Min M: | 34 |
| Elevation Max M: | 99 |
| Area Km2: | 29.49 |
| Population: | 2974 |
| Population Date: | 2019 |
| Population Footnotes: | [1] |
Saint-Pierre-de-Plesguen is a former commune in the Ille-et-Vilaine department in Brittany in northwestern France. On 1 January 2019, it was merged into the new commune Mesnil-Roc'h.[2]
Hughes Felicité Robert de Lamennais lived in Saint-Pierre-de-Plesguen during the 19th century.
Inhabitants of Saint-Pierre-de-Plesguen are called saint-pierrais in French.