Musée du Petit Palais, Modern art museum in Geneva, Switzerland

Musée du Petit Palais is a private art museum founded in 1968 by Oscar Ghez in a Second Empire hôtel particulier built in 1862 by Geneva architect Samuel Darier. The building was enlarged in 1967 to six floors, three of them underground, and five floors were used for exhibitions while the third basement served as a storage reserve. Its most ornate façade faces the old town.

Oscar Ghez (1905–1998), a Swiss industrialist of Tunisian Jewish origin, founded the museum in 1968 in a private mansion to show his collection of modern paintings, sculptures and drawings. After his death the museum closed in 1998; his nephew administered the institution from 2000 to 2005. Works are now lent for temporary exhibitions in Switzerland and abroad under the label Les Amis du Petit Palais.

The collection was assembled by Oscar Ghez, a Swiss industrialist of Tunisian Jewish origin, and covers movements from 1870 to 1930, with emphasis on the Impressionists and the School of Paris. Its Russian and Eastern European section holds works by Chagall, Soutine, Archipenko, Zadkine, Goncharova, Larionov, Sonia Delaunay, Lempicka, Chana Orloff and André Lanskoy. Since the 1998 closure, loans travel under the label Les Amis du Petit Palais.

The museum has been closed since 1998, after the death of its founder Oscar Ghez, so there are no galleries to visit today. The works are lent for temporary exhibitions in Switzerland and abroad under the label Les Amis du Petit Palais. The building itself, a Second Empire hôtel particulier from 1862 by Samuel Darier, stands in the old town, where excavation in 1967 uncovered the former city wall.

During the 1967 enlargement, excavation for the three underground levels uncovered the old city wall of Geneva's old town. The building now has six levels, five used for exhibitions and the third basement serving as a storage reserve for the works.