right|thumb|Marble Boat (1926)
right|thumb|Marble Boat
right|thumb|View from the bow
The Marble Boat (), also known as the Boat of Purity and Ease, is a lakeside pavilion on the grounds of the Summer Palace in Beijing, China.
It was first erected in 1755 during the reign of the Qianlong Emperor. The original pavilion was made from a base of large stone blocks which supported a wooden superstructure done in a traditional Chinese design. With this in mind, the Qianlong Emperor might have chosen to construct the Marble Boat as an auspicious symbol of a stable reign. The controller of the Admiralty, Prince Chun, owed much of his social standing as well as his appointment to Empress Dowager Cixi, who had adopted his eldest son, Zaitian, who was enthroned as the Guangxu Emperor. Because of this, he probably saw no other choice than to condone the embezzlement.
The pavilion is in length and stands on the northwestern shore of Kunming Lake, near the western end of the Long Corridor.