Rockdale is a suburb in southern Sydney, in the state of New South Wales, Australia. Rockdale is located 13 kilometres south of the Sydney central business district and is part of the St George area. Rockdale is one of the administrative centres for the local government area of the Bayside Council. Since 1985 Rockdale has been a twinned city with Bitola, in the Republic of Macedonia.

Southern Sydney is the southern metropolitan area of Greater Sydney, in the state of New South Wales, Australia.