| Longueil | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Longueil (Seine-Maritime).svg |
| Arrondissement: | Dieppe |
| Canton: | Dieppe-1 |
| Insee: | 76395 |
| Postal Code: | 76860 |
| Mayor: | Didier Ledrait[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CC Terroir de Caux |
| Coordinates: | 49.8836°N 0.9497°W |
| Elevation M: | 7 |
| Elevation Min M: | 1 |
| Elevation Max M: | 69 |
| Area Km2: | 11.73 |
Longueil (in French pronounced as /lɔ̃ɡœj/) is a commune in the Seine-Maritime department in the Normandy region in northern France.
A farming village situated by the banks of the river Saâne in the Pays de Caux, some 9miles southwest of Dieppe on the D 27 and the D 925 at its junction with the D 127 road.