The Museum of King John III's Palace at Wilanów[1] (Polish: Muzeum Pałacu Króla Jana III w Wilanowie) is a museum in Warsaw, Poland considered to be one of the oldest in the country and the repository of the country's royal and artistic heritage.

[2] In 1983, on the occasion of the 300th anniversary of the Battle of Vienna, the museum organized a jubilee exhibition "Glory and fame of John III in art and literature".

[3] Originally the royal belongings included 6 paintings by Rembrandt[3] and Johannes Vermeer's The Love Letter,[4] scattered after King's death.

The subsequent owners re-estabslished and enriched the collection with paintings by Lucas Cranach the Elder, Peter Paul Rubens, Jan Lievens, Charles Le Brun, Pompeo Batoni, Angelika Kauffmann and Anton Graff, among others.

Decorative platter by Hans Jacob Mair), biscuits, craft, objects from the Far East (e.g. Japanese nanban table adorned with mother-of-pearl), antiquities (e.g. Red — figure amphora by the Painter of the Louvre Gigantomachia and marble bust of a member of the Julio-Claudian dynasty) and royal memorabilia (e.g. dressing table of Queen Marie Casimire Sobieska).