Perth Museum and Art Gallery is the main museum and exhibition space in the city of Perth, Scotland. It is located in the Marshall Monument, named in memory of Thomas Hay Marshall, a former provost of Perth. The museum's location was formerly the site of a late 12th-century motte and bailey castle, built in 1160 to protect the Tay crossing. A great flood in 1209 washed the Castle away. The King, William I, was staying in it at the time and had to escape with his wife and entourage by boat to Scone. The building is to be rebranded as Perth Art Gallery in 2024, with Perth City Hall becoming Perth Museum.