The Electorate of Rockdale is an irregularly shaped NSW State Parliament electorate. Its eastern boundary is the Cooks River and the edge of Botany Bay. It takes in the entire Sans Souci peninsula at the southern end while the western boundary is formed by parts of Kogarah Bay, Lacey Street, Princes Highway, Harrow Road and Bexley Road.  The northern boundary is formed by Wolli Creek.

On its current boundaries, the electorate of Rockdale takes in the suburbs of Arncliffe, Banksia, Bardwell Park, Bardwell Valley, Beverley Park, parts of Bexley and Bexley North, Brighton-Le-Sands, Dolls Point, parts of Kogarah and Kogarah Bay, Kyeemagh, Monterey, Ramsgate, Ramsgate Beach, Rockdale, Sandringham, Sans Souci, Turella and Wolli Creek.