Château de Pontchartrain

The Château de Pontchartrain is mainly in the municipality of Jouars-Pontchartrain within Yvelines, in the west of the Île de France region of France.

The west end of its domain beyond its ornamental lake named the Étang du Château de Pontchartrain extends into the commune to the west, Le Tremblay-sur-Mauldre. The bulk of the building is two massive wings built in the mid-seventeenth century, by order of owner Louis I Phélypeaux, Comte de Pontchartrain, who was elevated in nobility and in ministerial rank to Chancellor of France.

Lake Pontchartrain in Louisiana was named after him as well as the historic Hotel Pontchartrain in New Orleans, as was Fort Pontchartrain du Détroit in Michigan and Detroit's Hotel Pontchartrain. The main building includes a gallery, dated to between 1598 and 1609, providing communication between the two wings.