Acacia burrowsiana Maslin, a new species of Acacia Mill. referable to sect. Juliflorae (Benth.) Maiden & Betche is described. It occurs in the south-west arid zone of Western Australia where it is known from only near Mt Magnet and Sandstone. Acacia burrowsiana was listed under its phrase name, Acacia sp. Mt Magnet (T. McKenzie 5), as a Priority One species under the Department of Environment and Conservation’s Conservation Codes for Western Australian Flora.