Château de Rixensart, Baroque castle in Rixensart, Belgium.

Château de Rixensart is a Renaissance-style castle built between 1631 and 1662 for Pierre-Ernest de Gavre and his son-in-law Philippe-Hippolyte Spinola, on the plan of a 13th-century fortress. It has a central courtyard, four octagonal corner towers, and a gate tower with a wooden and wrought-iron clock from 1738. The wings are of red brick with white stone mullioned windows, and the gardens are attributed to André Le Nôtre.

The lordship of Rixensart is recorded from 1217 and passed from the Limal lineage to the de Croy family in 1536. The present castle was built between 1631 and 1662 by Pierre-Ernest de Gavre and his son-in-law Philippe-Hippolyte Spinola, comte de Bruay, on the ground plan of a 13th-century stronghold. In 1715 the dowager countess of Bruay passed it to the de Merode family, which still lives there; the castle and grounds were listed as monuments in 1964.

The interior rooms display furniture from the Louis XV and XVI periods alongside Flemish tapestries in the formal reception areas. These collections show the taste of the noble families who lived here across generations.

The castle stands at the junction of rue de l'Église, avenue Royale and drève du Château, beside the Sainte-Croix church and facing the monument to Count Félix de Merode. The gardens lie east of the main quadrangle, reached past the forecourt and its outbuildings. The château and grounds have been listed as protected monuments since 15 May 1964, with the surrounding land added on 20 November 1972.

The porch tower's south face carries a large sundial at the second floor and a wall clock in wood and wrought iron at the top, above the entrance portal. The clock dates from 1738. The tower is topped by a slate spire pierced with dormer windows and crowned by a weather vane.