Underbool is a town in the Mallee region of north-west Victoria, Australia. The town is in the Rural City of Mildura local government area and on the Mallee Highway—between Ouyen and the South Australian border – 476 kilometres (296 mi) north west of the state capital, Melbourne. The town services the grain farmers and graziers in the area. For tourists it provides access to the Pink Lakes in Murray-Sunset National Park.