Khao Sam Roi Yot is a marine national park in Sam Roi Yot district, Prachuap Khiri Khan Province, Thailand. It covers 98.08 km², of which 20.88 km² are marine areas. The park was established in 1966, and was the first coastal national park of Thailand.
Rare animals in the park include the Mainland Serow , Dusky Langurs, as well as many bird species. In the ocean occasionally Irrawaddy Dolphins show up