Mu Ko Phetra is a marine national park in the Strait of Malacca off Thailand, covering mostly intact coastal line, open water, and about 30 islands of the southern part of Trang Province and the northern part of Satun Province.

Several islands are marine turtle egg laying sites.

In the caves of the cliffs high above the ground on some of the islands are where swiftlets build their nest and breed.

Traveling to those islands should be done with local tour companies as their boats are recognized and ignored by guards.

The continued existence of the park is threatened by the proposed Pak Bara deepwater seaport.