Château des Ternes, Historical mansion in 17th arrondissement, Paris, France.

Château des Ternes stands at 17–19 rue Pierre-Demours and 28 rue Bayen in Paris's 17th arrondissement. The cream stone facade has a dark slate mansard roof with three white-framed dormer windows and three tall arched windows with wrought-iron balconies. A round-arched passageway pierces the ground floor, opened when Nicolas Lenoir divided the property in 1781.

First recorded in 1320 as "villam externam", a farm outside the city walls in the parish of Villiers-la-Garenne, the estate was rebuilt during the Hundred Years War by Pierre Jourdaing, who surrounded it with walls. In 1548 Pierre Habert turned it into a larger residence with two turrets and a drawbridge. Pomponne de Mirey rebuilt it in 1715 as a manor with a park, removing the moats and drawbridge.

The name derives from the medieval farm of Esterne, first recorded in a 1320 charter of the Abbey of Saint-Denis as a "villam externam", a farm outside the town walls. Pierre Habert bought it in 1548 and turned it into a larger residence with two turrets and a drawbridge over the moats; Louis XIII made the estate a fief in 1634.

The protected facades and roofs can be seen from rue Pierre-Demours and rue Bayen. Walking past on both sides of these streets helps you fully appreciate the exterior of this designated monument.

In 1781 the architect Nicolas Lenoir bought out his partners and divided the property into four lots, opening a passage beneath the building that became rue Bayen after 1864. The entrance gate was sold to Jean-Baptiste-Jacques Élie de Beaumont and re-erected at his Château de Canon in Calvados, where it survives.