Beelu National Park, Nature reserve in City of Kalamunda, Australia.

Beelu National Park covers 46.17 km² south of Mundaring, east of Perth, within the Parks of the Darling Range. The Helena River runs through it and forms Lake CY O'Connor behind Mundaring Weir. The park's jarrah, marri, bull banksia, sheoak and grass tree woodlands are home to emus.

Mundaring National Park was gazetted in 1995 under the state government's Protecting Our Old Growth Forests policy. It was renamed Beelu in 2008 to acknowledge the traditional owners; Beelu comes from the Noongar word for river or stream, and the Beelu people's district was bounded by the Helena, Swan and Canning rivers.

The name Beelu comes from the Noongar word for river or stream, and the park was renamed in 2008 to acknowledge the Beelu people, whose district was bounded by the Helena, Swan and Canning Rivers. The Helena River runs through the park and forms Lake CY O'Connor behind Mundaring Weir.

The park offers several walking trails of varying difficulty, mountain biking routes, and a visitor centre with rest areas and facilities. Come prepared for changeable weather and bring sturdy shoes and plenty of water.

The South Ledge lookout, within the park, faces Mundaring Weir and Lake CY O'Connor. The park also holds the largest oak tree in Western Australia, in Fred Jacoby Park, and two campsites for overnight stays.