Blackburn South is a suburb of Melbourne, Victoria, Australia, 16 km east of Melbourne's Central Business District. Its local government area is the City of Whitehorse. At the 2011 Census, Blackburn South had a population of 10,584.
Blackburn South is bordered by Canterbury Road, Middleborough Road, Eley Road, and by an irregular line to the east of Blackburn Road. Furthermore, the suburb is informally divided between Blackburn South Proper to the west of Blackburn Road, and Blackburn South Heights to the east of Blackburn Road.