Caix (; ) is a commune in the Somme department in Hauts-de-France in northern France. Its 13th-16th century church is a listed monument.
Caix is situated on the D28 road, some southeast of Amiens.
In the First World War Caix was under German occupation for most of the period. It was recaptured by the 1st Canadian Division on 8 August 1918.