| Saint-Méloir-des-Ondes | |
| Native Name: | (Gallo) |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Saint-Méloir-des-Ondes 35.svg |
| Coordinates: | 48.6383°N -1.9017°W |
| Arrondissement: | Saint-Malo |
| Canton: | Saint-Malo-1 |
| Insee: | 35299 |
| Postal Code: | 35350 |
| Mayor: | Dominique De La Portbarre[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Pays de Saint-Malo |
| Elevation M: | 51 |
| Elevation Min M: | 2 |
| Elevation Max M: | 58 |
| Area Km2: | 29.49 |
| Image Flag: | Flag of Saint-Méloir-des-Ondes.gif |
Saint-Méloir-des-Ondes (in French pronounced as /sɛ̃ melwaʁ de.z‿ɔ̃d/; Gallo: Saent-Mleï, Breton: Sant-Meleg) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France. It is located near Saint-Malo.
The parish was named after St Melor a Breton and Cornish saint, by the monks of Mont Saint-Michel, who established a priory there in the early 11th century.
Inhabitants of Saint-Méloir-des-Ondes are called méloriens in French.