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 northern tip of Ko Phaluai is also part of the marine park. There is a ranger station, bungalows, shop and restaurant at Ko Wua Talap at Ao Phi.
The name Ang Thong means bowl of gold, while Mu Ko simply means group of islands.
Since 2002 the park is also registered as Ramsar site number 1184.