Mu Ko Ang Thong is a marine national park in the Gulf of Thailand, at the shore of the Surat Thani Province. It covers 42 islands in a total area of 102 km², of which only 18 km² are land. The park was established on November 12, 1980.
The name Ang Thong (Thai: อ่างทอง) means bowl of gold, while Mu Ko (หมู่เกาะ) simply means group of islands.
Since 2002 the park is also registered as Ramsar site number 1184.
In contemporary culture, the marine park was the location for the island paradise in the novel The Beach by Alex Garland