Tathra National Park, Nature reserve in Shire of Carnamah, Australia.

Tathra National Park is a 43 km² national park in Western Australia, 240 km north of Perth between Eneabba and Carnamah. It lies in sandplain country surrounded by farmland, with shallow sandy valleys and laterite on slopes and hilltops. The park is split into two sections by the Eneabba–Carnamah road and has no visitor facilities.

The area was protected by the Department of Lands and Surveys in 1969 and formally designated as a National Park in 1971. This early recognition established the reserve as an important conservation area in the region.

The name Tathra comes from a Noongar word meaning "beautiful place". The park lies between Eneabba and Carnamah, and a 1974 report noted that public use was mainly wildflower observation in winter and spring.

The park has no visitor facilities and is split into two sections by the Eneabba–Carnamah road, which crosses it. Access is from Winchester-Eneabba Road between Eneabba and Carnamah, about 240 km north of Perth. Wildflower viewing is best in winter and spring.

A species of Daviesia with large red flowers grows only within this reserve and nowhere else on Earth. This plant makes the park botanically special and worth protecting.