The Musée Cognacq-Jay is a museum located in the Hôtel Donon in the 3rd arrondissement at 8 rue Elzévir, Paris, France. It is open daily except Monday; admission is free. The nearest Metro stations are Saint-Paul and Chemin Vert.
The museum's collection was formed between 1900–1925 by Théodore-Ernest Cognacq (1839–1928) and his wife Marie-Louise Jay (1838–1925), founders of La Samaritaine department store. At his death, Cognacq gave the collection to the City of Paris, which in 1929 inaugurated the Musée Cognacq-Jay at 25 boulevard des Capucines, a building especially conceived for it by the Cognacq couple, who wished to display the collection in the intimacy of a seemingly inhabited home, without the conventions of a museum. In 1990 however, the City, arguing that the Boulevard des Capucines was not part of a "cultural circuit", sought the approval of the legal heirs (the owners of La Samaritaine), and, under silent disagreement of the Cognacq-Jay family, moved the collection to the ill-fitting Hôtel Donon (c. 1575) in the Marais, where the collection is displayed in twenty paneled rooms (four floors) in the styles of Louis XV and Louis XVI. The renovation work of the Hôtel Donon was led by Paris' chief architect Bernard Fonquernie, whilst the interior renovation was done by Reoven Vardi.
The museum contains an exceptional collection of fine art and decorative items, about 1200 items in total, with an emphasis on 18th century France, ranging from European and Chinese ceramics, jewels, and snuffboxes, to paintings by Louis-Léopold Boilly, François Boucher, Canaletto, Jean-Siméon Chardin, Jean-Honoré Fragonard, Jean-Baptiste Greuze, Maurice Quentin de La Tour, Sir Thomas Lawrence, Hubert Robert, Giovanni Battista Tiepolo, and Jean-Antoine Watteau; sculpture by Jean-Antoine Houdon, Jean-Baptiste Lemoyne, and Jacques-François-Joseph Saly; and fine furniture attributed to Jean-François Oeben and Roger Vandercruse Lacroix. 17th century is also represented, notably with two paintings by Rembrandt while 19th century is represented with works by Camille Corot, Paul Cézanne and also Edgar Degas.