Cundinup is a rural locality of the Shire of Nannup in the South West region of Western Australia.

A small section in the far east of the locality is located in the Shire of Donnybrook–Balingup.

The western boundary of the locality is formed by the Vasse Highway while, in the east, the border runs along the Blackwood River in places.

Much of the locality is covered by state forest.

[2][3] It is located on the traditional land of the Noongar nation.