Clayton South is a suburb in Melbourne, Victoria, Australia, 21 km south-east from Melbourne's central business district. Its local government area is the City of Kingston. At the 2011 Census, Clayton South had a population of 11,625.
The suburb sometimes goes by the name Westall, due to the name of the main road and the railway station that serve the area. Westall is not, however, an official name, and all post addressed to the area is addressed to Clayton South.