Mumballup is a locality in the South West region of Western Australia, situated between Collie and Boyup Brook, 221 kilometres (137 mi) south of Perth.

[2] It was the location of the death of the former premier of Western Australia James Mitchell in 1951,[3] on a train on the Donnybrook–Katanning railway line.

[5][6] The Mumballup siding, which opened in 1908, was closed in 1980.

[7] It is a location on the Bibbulmun Track.

[8][9] Mumballup and the Shire of Donnybrook–Balingup are located on the traditional land of the Wardandi people of the Noongar nation.