| Le Plessier-sur-Saint-Just | |
| Commune Status: | Commune |
| Arrondissement: | Clermont |
| Canton: | Saint-Just-en-Chaussée |
| Insee: | 60498 |
| Postal Code: | 60130 |
| Mayor: | François Lefèvre[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Plateau Picard |
| Coordinates: | 49.5117°N 2.4547°W |
| Elevation M: | 110 |
| Elevation Min M: | 90 |
| Elevation Max M: | 162 |
| Area Km2: | 7.63 |
Le Plessier-sur-Saint-Just (pronounced as /fr/, literally Le Plessier on Saint-Just) is a commune in the Oise department in northern France.