Château-Salins (French: [ʃɑto salɛ̃]; German: Salzburg, from 1941 to 1944 Salzburgen) is a commune in the Moselle department in Grand Est in north-eastern France.

The territory on which the castle, and later the town, was built was part of the domains of the bishopric of Metz.

Legend has it that pilgrims on their way to Saint-Nicolas-de-Port discovered a salt spring.

Around 1340, the regent Elisabeth of Austria, widow of Duke Ferry IV, had a castle built to protect the exploitation of this spring.

To control the ducal building, Bishop Adhémar de Monteil also had a fortress built, which he named Beaurepaire, at some distance from there.