The Division of Wannon is an Australian Electoral Division in the state of Victoria. It is located in the south-west of the state, and encompasses most of the western region of the state. It adjoins the South Australian border in the west, and the Bass Strait coast in the south. The Division encompasses the towns of Warrnambool, Portland, Ararat, Hamilton and Halls Gap. The Grampians and the Port Campbell National Parks are in the Division.