L'Armendèche lighthouse, Art Deco lighthouse in Les Sables-d'Olonne, France.

L'Armendèche is a 38.96-metre hexagonal concrete lighthouse in La Chaume, Les Sables-d'Olonne, designed by Maurice Durand in the Art Deco style. Its white tower carries a red-painted lantern and gallery at the top, and a narrow strip of dark windows runs up the centre of the visible face.

Built in 1968 by architect Maurice Durand, this tower was created to give local sailors better visibility as the shoreline changed with development. It gained recognition as a historical monument in 2012, honoring its role in French maritime building tradition.

The name comes from the lieu-dit l'Armandèche at La Chaume, a local deformation of "Normandie" recalling the Norman invasions of the first millennium. The light shows three white flashes in a two-one pattern every fifteen seconds, and from the sea the beams are seen turning around the tower because the bulb is fixed while the optic rotates on a mercury bath.

The lighthouse cannot normally be entered; it opens only during the Journées du patrimoine. It stands on the mainland west of the port of Les Sables-d'Olonne, in the La Chaume district, and is controlled remotely from the town. Approach on foot along the rocky shore and keep a safe distance from the tower base.

Its lamp stays fixed while the optic rotates on a bath of mercury, so from the sea the beams appear to circle the tower. The light shows three white flashes in a two-one pattern every fifteen seconds. It is automated and remotely controlled from Les Sables-d'Olonne.