Greater Preston National Park, Nature reserve in Shire of West Arthur, Western Australia.

Greater Preston National Park is a large nature reserve in Western Australia covering approximately 11000 hectares of diverse woodland and shrubland habitats. The landscape contains several distinct vegetation zones, with old-growth Jarrah forests forming the backbone of the ecosystem alongside denser shrub areas and scattered Wandoo trees.

Greater Preston National Park was created on 8 December 2004 by an act of the Parliament of Western Australia as Class A reserve No. 47661, covering 11,373 hectares. It was one of 19 national parks declared in the state that day. The park lies mainly in the Shires of Boyup Brook and Donnybrook–Balingup, with its north-eastern corner reaching into the Shires of Collie and West Arthur.

The park lies on land whose traditional owners are the Kaniyang and Wiilman peoples, as recorded in the source for this reserve. The name Preston is shared with the nearby Preston River and the locality of Greater Preston, and the park is one of 19 national parks declared in Western Australia on 8 December 2004.

The Bibbulmun Track, a long-distance walking route, passes through the western section of the park and is popular with hikers seeking multi-day treks through natural landscape. The park suits both day visitors and those planning longer expeditions, depending on fitness and available time.

The park was one of 19 national parks declared by the Parliament of Western Australia on 8 December 2004, created as Class A reserve No. 47661. Its roughly 11,373 hectares straddle the Donnybrook-Boyup Brook Road, and the north-eastern corner reaches into the Shire of Collie and Shire of West Arthur.