Château de Beauregard, La Celle-Saint-Cloud, French château in La Celle-Saint-Cloud, France.

Château de Beauregard is a former castle in La Celle-Saint-Cloud situated on a hillside between two communities. Today only fragments of the central structure remain, as the site has been redeveloped with modern housing and public green spaces managed by the city.

The Beauregard estate's name goes back to Jeanne de Sansac, dame de Beauregard, buried in the parish church in 1547. In the early 17th century it belonged to the du Val family, and Pierre de Paris, who inherited it in 1661, received Lully and Quinault there. Harriet Howard bought it in 1852 and rebuilt it in neoclassical style; it was razed for dilapidation, leaving only the central pediment facade.

The name Beauregard is attested from the Middle Ages through Jeanne de Sansac, dame de Beauregard, whose tomb inscription in the parish church records her death on 6 July 1547. In the 17th century the du Val and de Paris families kept a lavish household there and received Jean-Baptiste Lully and Philippe Quinault, who are said to have stayed at the château.

Only the central pediment facade survives, on the hill above La Celle-Saint-Cloud at over 160 m altitude, between the town and Le Chesnay. The former estate grounds are now occupied by social housing built by the city of Paris between 1959 and 1968, so the remnant is seen from the surrounding streets rather than as a visitable monument.

In November 1947, 400 gendarmes and 150 police officers, backed by two tanks, searched the Beauregard repatriation camp for three children hidden there by their mother, Sofia Subbotina. The raid also turned up machine guns, submachine guns and grenades; the camp closed and Colonel Filatov, head of the Soviet repatriation group, was expelled from France.