The Château de Breteuil (previously called the Château de Bevilliers) is a château situated in the Vallée de Chevreuse in Yvelines department of France, 35 km (22 mi) to the south-west of Paris. The château was designated a monument historique in 1973.
The family of the Marquis de Breteuil who still lives there gave three ministers to the Kings of France.
The building compares with the Château of Dampierre-en-Yvelines by Jules Hardouin-Mansart.
On March 12, 1881, the Marquess Henri de Breteuil organized a secret meeting at the "chateau" with the future King Edward VII and Gambetta, President of the Chamber of Deputies. This constituted the beginnings of the Entente Cordiale. In 1912, another Prince of Wales, the future Duke of Windsor, stayed with the Breteuil family for four months to learn French.
Coordinates: 48°40′49″N 2°01′23″E / 48.68028°N 2.02306°E