The Museum of King John III's Palace at Wilanów 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. The collection consists of valuables collected by subsequent owners of the Wilanów Palace, the Kings of Poland — John III Sobieski and Augustus II, as well as by representatives of noble families of Potocki, and Lubomirski and a collection of Sarmatian art.

Wilanów Palace is a former royal palace located in the Wilanów district of Warsaw, Poland. It was built between 1677–1696 for King of Poland John III Sobieski according to a design by architect Augustyn Wincenty Locci. Wilanów Palace survived Poland's partitions and both World Wars, and so serves as one of the most remarkable examples of Baroque architecture in the country.