The Musée Cognacq-Jay is a museum located in the Hôtel Donon in the 3rd arrondissement at 8 rue Elzévir, Paris, France. 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. In 1990 it was moved to the Hôtel Donon (circa 1575) in the Marais, where the collection is displayed in twenty paneled rooms (four floors) in the styles of Louis XV and Louis XVI..