| Saint-Onen-la-Chapelle | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Saint-Onen-la-Chapelle (Ille-et-Vilaine).svg |
| Coordinates: | 48.1778°N -2.1717°W |
| Insee: | 35302 |
| Postal Code: | 35290 |
| Arrondissement: | Rennes |
| Canton: | Montauban-de-Bretagne |
| Mayor: | Jean-François Bohanne[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Saint-Méen Montauban |
| Elevation Min M: | 57 |
| Elevation Max M: | 114 |
| Area Km2: | 24.73 |
Saint-Onen-la-Chapelle (in French pronounced as /sɛ̃.t‿ɔnɛ̃ la ʃapɛl/;) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.
Inhabitants of Saint-Onen-la-Chapelle are called onenais in French.