Wellington National Park, Nature reserve in Shire of Harvey, Western Australia.

Wellington National Park is a nature reserve in the Shire of Harvey in Western Australia that spans forested terrain with the Collie River valley and Wellington Dam. The park features walking trails, picnic areas, and lookout points that allow visitors to explore the natural landscape.

The land was formerly held by the Worsley Timber Company and was gazetted as a class A reserve for the purpose of "national park" in 2000. Under the 2001 "Protecting our old-growth forests" policy the park grew from 4,300 ha to 17,000 ha. In December 2004, 13,745 ha of State forest No. 25 was added, bringing the total to 16,790 ha.

The park lies in the traditional country of the Noongar people, whose name for the Collie River area is connected to the waterway that runs through the Collie River valley. The river pools formed by rounded granite boulders were used as camping and meeting places, and the jarrah, marri and yarri forests provided food, medicine and materials. Today the Collie River and its pools remain important to Noongar communities.

The park has two camping areas at Potter's Gorge and Honeymoon Pool with barbecue and picnic facilities plus swimming opportunities. Visitors should check which areas are accessible before arrival and which season best suits their planned activities.

The park's granite bedrock belongs to the Yilgarn craton, one of the oldest surviving pieces of Earth's crust. In the Collie River bed, large rounded granite boulders sit in the water and form pools used for swimming. The German sources count 117 animal species, including 112 birds, 11 mammals and 309 plants.