Castle of Mazères, Medieval castle in Barran, France.

Castle of Mazères sits on a raised platform ringed by ditches and features a rectangular plan with buildings arranged around a central courtyard with rusticated porticoes. The restored rooms include a Louis XV staircase and coffered ceilings that span different time periods.

The castle began in the 11th century and received land donations around Barran, including vineyards at Mazères from 1080 onward. It became a summer retreat for the archbishops of Auch.

The name Mazères derives from Maceria, the Latin for rubble or ruined walls, recorded in the 12th century as Villa de Maceria. The archbishops of Auch kept the estate as their summer residence, and the painted decoration of the chapel was redone in the 19th century. The salon and the archbishop's chamber retain their remarkable stucco work.

The castle is private property, so visits depend on the owners' arrangements rather than regular opening hours; check before travelling. The buildings stand on a raised platform ringed by ditches, with the main tower at the south-west corner. Parts of the site have been protected as monuments historiques since 21 September 1981, with the park's vivier and nymphée added on 9 May 1989.

A carved stone rose found in the former aula resembles one in the lower chapel of the Palace of the Kings of Majorca in Perpignan, dated 1291, which supports dating the castle's construction to the late 13th century. Ceramic floor tiles of types made between 1280 and 1350 were also found here, as at Flaran Abbey.