| Saint-Martin-des-Champs | |
| Commune Status: | Commune |
| Arrondissement: | Mantes-la-Jolie |
| Canton: | Bonnières-sur-Seine |
| Insee: | 78565 |
| Postal Code: | 78790 |
| Demonym: | Saint-Martinois |
| Mayor: | Stéphane Bazonnet[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Pays houdanais |
| Coordinates: | 48.8822°N 1.7181°W |
| Elevation Min M: | 71 |
| Elevation Max M: | 174 |
| Area Km2: | 6.21 |
Saint-Martin-des-Champs (in French pronounced as /sɛ̃ maʁtɛ̃ de ʃɑ̃/) is a commune in the Yvelines department in the Île-de-France region in north-central France.