The City of Botany Bay was a local government area in the eastern region of Sydney, in the state of New South Wales, Australia. The area encompassed the suburbs to the north of Botany Bay, such as Botany. The administrative centre was located at Mascot, which is 7 kilometres (4.3 mi) south of the Sydney central business district. The City was amalgamated with the neighbouring City of Rockdale on 9 September 2016 to form Bayside Council.

The Mayor of the City of Botany Bay Council prior to amalgamation was Cr. Ben Keneally, a member of the Labor Party and the husband of Kristina Keneally, a former Premier of New South Wales.

Suburbs in the City of Botany Bay were:

As of the 2011 census, there were 39,356 people in the Botany Bay local government area, of these 49.5% were male and 50.5% were female. Aboriginal and Torres Strait Islander people made up 1.6% of the population. The median age of people in the City of Botany Bay was 37 years. Children aged 0 – 14 years made up 18.2% of the population and people aged 65 years and over made up 14.4% of the population. Of people in the area aged 15 years and over, 47.6% were married and 11.4% were either divorced or separated.

Population growth in the City of Botany Bay between the 2001 census and the 2006 census was 5.18%; and in the subsequent five years to the 2011 census, population growth was 5.19%. When compared with total population growth of Australia for the same periods, being 5.78% and 8.32% respectively, population growth in Botany Bay local government area was lower than the national average.

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