Sans Souci is a southern Sydney suburb in the state of New South Wales, Australia. Sans Souci is 17 kilometres south of the Sydney central business district and lies across the local government areas of the City of Rockdale and the Municipality of Kogarah. It is part of the St George area.
Sans Souci sits on the western shore of Botany Bay. Lady Robinsons Beach and Cook Park run along the eastern border. Kogarah Bay runs along the western border. Sans Souci is connected to Taren Point, in the Sutherland Shire, to the south, by the Captain Cook Bridge over the Georges River.