Prostanthera cuneata (alpine mint bush or rough mint bush) is a species of flowering plant in the family Lamiaceae, native to south-eastern Australia. It is a bushy evergreen shrub with a compact habit, growing to 90 cm (35 in) both in height and width. The leaves have a rounded apex and cuneate base and are 4 to 5 mm long and 3 to 3.5 mm wide. The leaves are strongly aromatic when crushed. Flowers are produced from November to April (mid-spring to mid-autumn) in the species' native range.