Diamond Tree is a rural locality of the Shire of Manjimup in the South West region of Western Australia.

Parts of the Sir James Mitchell National Park is also located within Diamond Tree.

[2][3] The heritage listed Diamond Tree, with its former fire lookout tower, is located in the north-east of the locality.

[4] The locality of Diamond Tree is located on the traditional land of the Bibulman people of the Noongar nation.

[5][6][7] The locality was a stop on the Northcliffe branch railway.