Prostanthera incana, commonly known as velvet mintbush, is a shrub that is native to south-eastern Australia. It has an erect habit, growing to between 1 and 2.5 metres high. The leaves are 9 to 18 mm long and 6 to 13 mm wide. The lilac flowers appear between August and December in the species native range. The species was formally described in 1834 based on specimens collected by Alan Cunningham. It occurs in New South Wales and Victoria.