The City of Rockdale was a local government area in southern and St George regions of Sydney, in the state of New South Wales, Australia. The city centre was located 12 kilometres (7.5 mi) south-west of the Sydney central business district, on the western shores of Botany Bay. Rockdale was amalgamated with the neighbouring City of Botany Bay on 9 September 2016 to form the new municipality of Bayside Council.

The City of Rockdale has been previously known as the Municipality of West Botany and the Municipality of Rockdale. The City of Rockdale was declared in 1995.

The Mayor of the City of Rockdale at amalgamation was Cr. Bill Saravinovski, a member of the Labor Party.

Suburbs in the City of Rockdale were:

The City of Rockdale also managed and maintained the following localities:

At the 2011 Census, there were 97,340 people in the Rockdale local government area, of these 49.4% were male and 50.6% were female. Aboriginal and Torres Strait Islander people made up 0.6% of the population. The median age of people in the City of Rockdale was 36 years. Children aged 0 – 14 years made up 17.4% of the population and people aged 65 years and over made up 15.1% of the population. Of people in the area aged 15 years and over, 50.9% were married and 10.8% were either divorced or separated.

Population growth in the City of Rockdale between the 2001 Census and the 2006 Census was 5.09%; and in the subsequent five years to the 2011 Census, population growth was 5.66%. When compared with total population growth of Australia for the same periods, being 5.78% and 8.32% respectively, population growth in the Rockdale local government area was on par with the national average. The median weekly income for residents within the City of Rockdale was on par with the national average.

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