The Château Sainte-Marie is a castle dating from the second half of the 16th century, modified and altered during the 19th century, in the commune of Longages in the Haute-Garonne département of France.
Privately owned, it has been listed since 1984 as a monument historique by the French Ministry of Culture.
Coordinates: 43°21′27″N 1°14′22″E / 43.35750°N 1.23944°E