The City of Penrith is a City in the state of New South Wales, Australia. The seat of the City is located in Penrith, located about 50 kilometres (31 mi) west of Sydney's central business district. It occupies part of the traditional lands of the Darug people.

The Municipality of Penrith was incorporated on 12 May 1871 under the Municipalities Act 1858 (NSW). On 3 March 1890, St Marys was separately incorporated, and on 26 July 1893 and 9 September 1895, Mulgoa and Castlereagh followed respectively. In 1913, Mulgoa became the "A" Riding of the neighbouring Nepean Shire. On 1 January 1949, the Municipalities of Penrith, St Marys and Castlereagh and part of the Nepean Shire amalgamated to form a new Municipality of Penrith. It was declared a City on 21 October 1959, and expanded westwards to include Emu Plains and Emu Heights, formerly part of the City of Blue Mountains, on 25 October 1963.

The Mayor of the City of Penrith is Cr. John Thain, a member of the Labor Party.

Penrith is a growing regional city. Between the 2006 and 2011 Census, the population increased by more than 6,000 people to a total current 2014 estimated resident population of 194,134. This growth is forecast to continue into the future with a population of 223,631 expected by 2031.

The following suburbs and localities are located within the City of Penrith:

At the [[Census in Australia#2011|2011 census]], there were 178,467 people in the Penrith local government area, of these 49.3% were male and 50.7% were female. Aboriginal and Torres Strait Islander people made up 3.0% of the population; notably above the national average of 2.5%. The median age of people in the City of Penrith was 34 years; notably below the national median of 37 years. Children aged 0 – 14 years made up 21.7% of the population and people aged 65 years and over made up 9.6% of the population. Of people in the area aged 15 years and over, 48.5% were married and 12.1% were either divorced or separated.

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