Longueau (French pronunciation: [lɔ̃ɡo]; Picard: Londjeu) is a commune in the Somme department in Hauts-de-France in northern France.

Longueau is situated 4 miles (6 km) 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 reinforced concrete depot, now a registered historic monument is one of four designed by Bernard Lafaille between the two world wars.

This Arrondissement of Amiens geographical article is a stub.