| Saint-Martin-Longueau | |
| Commune Status: | Commune |
| Arrondissement: | Clermont |
| Canton: | Pont-Sainte-Maxence |
| Insee: | 60587 |
| Postal Code: | 60700 |
| Mayor: | Denis Messio[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Pays d'Oise et d'Halatte |
| Coordinates: | 49.3428°N 2.605°W |
| Elevation M: | 40 |
| Elevation Min M: | 31 |
| Elevation Max M: | 53 |
| Area Km2: | 3.62 |
Saint-Martin-Longueau (pronounced as /fr/) is a commune in the Oise department in northern France.[2]