The Château de La Coste is a ruined castle in the commune of Grézels in the Lot département of France.
It was restored at the end of the 16th century after it was ruined in 1580 during its capture by Protestant troops.
It comprises a rectangular corps de logis extended by two wings and a curtain wall in the south which encloses the courtyard.
The north wing (former stables), having been used as a source of stones to build the house of a former owner, was equipped with an open gallery to ensure weatherproofing.
The two square towers still have the latrines in the corner made with the corps de logis.