| Saint-Mars-de-Locquenay | |
| Commune Status: | Commune |
| Arrondissement: | Mamers |
| Canton: | Saint-Calais |
| Insee: | 72298 |
| Postal Code: | 72440 |
| Mayor: | Vincent Barrais[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Le Gesnois Bilurien |
| Coordinates: | 47.9294°N 0.485°W |
| Elevation Min M: | 102 |
| Elevation Max M: | 167 |
| Area Km2: | 21.74 |
| Demonym: | Loquenaysien, Loquenaysienne |
Saint-Mars-de-Locquenay (in French pronounced as /sɛ̃ maʁ də lɔknɛ/) is a commune in the Sarthe department in the region of Pays de la Loire in north-western France.