The City of Wyndham is a Local Government Area in Victoria, Australia, located in the outer south-western suburbs of Melbourne, between Melbourne and the regional city of Geelong. It has an area of 542 square kilometres (209 sq mi) and at the 2006 Census Wyndham had a population of 112,695.
The Wyndham District was first incorporated as a local government entity on 6 October 1862. Under changes made to local government legislation, it became the Shire of Wyndham on 7 March 1864 and was renamed the Shire of Werribee on 15 December 1909.
With an initial size of 715 square kilometres (276 sq mi) and being largely rural in character, the shire ceded land to metropolitan Melbourne as suburban development encroached. On 6 January 1922 and 5 February 1941, the City of Footscray annexed two parcels of land totalling about 700 hectares. On 20 February 1957, the Altona Riding of the Shire of Werribee was severed and incorporated as the Shire of Altona, which became a City eleven years later. After this, the boundaries remained fairly stable, and on 20 March 1987 Werribee was proclaimed a City.