The Fairfield City Council is a local government area in the west of Sydney, in the state of New South Wales, Australia. The council was first incorporated as the "Municipal District of Smithfield and Fairfield" on 8 December 1888, and the council's name was changed to the "Municipality of Fairfield" in 1920, before being proclaimed a city in 1979. The City of Fairfield comprises an area of 102 square kilometres (39 sq mi) and as of the 2021 census had a population of 208,475. The mayor of the City of Fairfield is Cr. Frank Carbone, the first popularly-elected independent mayor of Fairfield.

Greater Western Sydney (GWS) is a large region of the metropolitan area of Greater Sydney, New South Wales (NSW), Australia that generally embraces the north-west, south-west, central-west, far western and the Blue Mountains sub-regions within Sydney's metropolitan area and encompasses 11 local government areas: Blacktown, Blue Mountains, Camden, Campbelltown, Cumberland, Fairfield, Hawkesbury, Liverpool, Parramatta, Penrith and Wollondilly. It includes Western Sydney, which has a number of different definitions, although the one consistently used is the region composed of ten local government authorities, most of which are members of the Western Sydney Regional Organisation of Councils (WSROC). The NSW Government's Office of Western Sydney calls the region "Greater Western Sydney".