| Longueau | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason longueau (80) Somme- France.svg |
| Arrondissement: | Amiens |
| Canton: | Amiens-4 |
| Insee: | 80489 |
| Postal Code: | 80330 |
| Mayor: | Pascal Ourdouillé[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Amiens Métropole |
| Coordinates: | 49.8708°N 2.3569°W |
| Elevation M: | 28 |
| Elevation Min M: | 23 |
| Elevation Max M: | 64 |
| Area Km2: | 3.42 |
Longueau (in French pronounced as /lɔ̃ɡo/; Londjeu) is a commune in the Somme department in Hauts-de-France in northern France.
Longueau is situated 4miles southeast of Amiens, a suburb just by the airport, on the N29 road. Longueau station has rail connections to Amiens, Creil, Arras, Lille, Compiègne and Paris.
The town was once a railway centre. The reinforced concrete depot, now a registered historic monument is one of four designed by Bernard Lafaille between the two world wars.
Longeau hosts a British military cemetery containing 204 Commonwealth war dead, primarily from the First World War.