Tuan Chau is a schist island on the south-west side of Hạ Long City in Vietnam. Covered by pine forest, has an area of 2.2 km² and to the east and south are two man made beaches endowed with very white, fine sand.

The octagonal house where President Hồ Chí Minh stayed when he vacationed here has now become a memorial site. Nowadays, Tuần Châu Island is one of the most touristic destinations in Hạ Long City. Tuần Châu is in an important position at the entrance of the waterway system of Thăng Long, Bặch Đằng and Vân Ðồn. This is why in the feudal time, the royal army set up a guard station here to patrol and defend the borderland.