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.

The name Khao Sam Roi Yot means Mountains with 300 peaks, which describes the landscape of the park quite well. The limestone hills rise directly at the shore of the Gulf of Thailand, with the highest elevation Khao Krachom 605m above sea level. Between the hills are freshwater marshes. However several of these marshes were converted into shrimp farms, as only 36 km² of the total 69 km² of marshes are part of the national park. 18 km² of these marshes are scheduled to be declared a Ramsar site.

Two white sand beaches are located within the park namely Hat Laem Sala and Hat Sam Phraya. Hat Laem Sala is 17 km away from the park's head quarters and can be reached from the village Ban Pu either by boat or by climbing up and down over a hill for nearly 30 minutes.

Rare animals in the park include the Mainland Serow (Nemorhaedus sumatraensis), Dusky Langurs (Trachypithecus obscurus), as well as many bird species. In the ocean occasionally Irrawaddy Dolphins (Orcaella brevirostris) show up.

Legends on Khao Sam Roi Yot

The giant Mong Li and his wife, who lived on the western coast of the Gulf of Thailand, had promised their daughter independently to Chao Lai and the emperor of China. When the daughter became old enough to marry, both future husbands arrived at the same date.

Mong Li then cut his daughter into two halves. Chao Lai turned himself into a hill, while the traditional fruit basket to be presented to a Buddhist monk has turned into the Khao Sam Roi Yot mountains. The islands Ko Chang and Ko Kong on the other side of the gulf were the elephant and the ox-cart with the wedding presents. Nom Sao Island is the part of the daughter's breasts and Ao Sam Roi Yot, Ko Ram Island and Nom Sao Island's silhouette, seen from certain angles, look like a person resting in the middle of the sea. There is a Goddess shrine on Nom Sao Island that is a popular attraction.

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