Watamu Marine National Park, Marine national park in Kilifi County, Kenya.

Watamu Marine National Park is a 10 km² protected area 300 m off the Kenyan coast, about 120 km north of Mombasa and 28 km south of Malindi. Its coral gardens, part of the Malindi–Watamu reserve, hold over 150 coral species and more than 500 fish species, including whale sharks, manta rays and octopus.

Watamu Marine National Park and Reserve was created in 1968 by the Kenyan government together with Malindi Marine National Park and Reserve, making it one of Kenya's first marine parks. In 1979 the Malindi-Watamu reserve was added to the UNESCO list of biosphere reserves. Coral bleaching in 1997-1998 caused heavy coral mortality, and Watamu recovered more slowly than average.

Fishermen may still fish inside the reserve using traditional methods, provided they take only permitted species. Watamu Turtle Watch pays them to tag and release turtles caught in their nets, then volunteers measure and tag the animals at the landing site. The same centre rehabilitates sick turtles and runs an adopt-a-turtle programme.

Coral gardens begin about 300 m from the shore, so most of the park is reached by boat from the Watamu landing site. Water temperature runs from 20 °C between June and November to 30 °C from December to May. The park lies roughly 120 km north of Mombasa and 28 km south of Malindi.

Watamu Turtle Watch pays local fishermen to tag and release turtles caught in their nets, compensating them for lost gear; volunteers then measure and tag the animals at the landing site. The main park beach is monitored as a 99% viable nesting site for green, hawksbill and olive ridley turtles, while leatherbacks only pass through nearby waters.