The City of Mordialloc was a local government area about 20 kilometres (12 mi) south of Melbourne, the state capital of Victoria, Australia, on the eastern side of Port Phillip.

The city covered an area of 13.57 square kilometres (5.24 sq mi), and existed from 1920 until 1994.

The eastern section of Beaumaris was transferred to the newly created City of Bayside.

It presently serves as a council service centre and library for the City of Kingston.

The City of Mordialloc was subdivided into three wards, each electing three councillors:[2] * Council seat.