Nanga Brook is a former town located in the Peel region of Western Australia in the Lane Poole Reserve between Dwellingup and Waroona.

In 1909 a townsite was laid out and built by Millars, complete with 56 homes and several other lodgings, a store, butcher, hall, billiard room and school.

The two World Wars affected production greatly, with many of the mill workers either fighting overseas or serving in home defence.

A massive appeal was mounted through Perth and eastern states newspapers by the Australian Red Cross and other charities meeting with a generous response, which ensured the workers and their families were able to rebuild their lives.

Only one or two roads in the area are sealed, and a CALM-issued paper has identified this as a matter to be rectified, along with the overuse of non-designated campsites, visitor behaviour and safety, dogs in the reserve and firewood collection.