Hat Chao Mai National Park is a protected area located in the Sikao and Kantang Districts of Trang Province, Thailand. It is a marine national park. Established in 1981, it is an IUCN Category II protected area with coral reefs, and an area measuring 144,292 rai~ 231 square kilometres. The park has been designated as a Ramsar site since 2002. It has also been designated an Important Bird Area by BirdLife International because it supports a significant population of large green-pigeons.