Blacktown City Council is a local government area in Western Sydney, situated on the Cumberland Plain, approximately 35 kilometres (22 mi) west of the Sydney central business district, in the state of New South Wales, Australia. Established in 1906 as the Blacktown Shire and becoming the Municipality of Blacktown in 1961 before gaining city status in 1979, the City occupies an area of 246.9 square kilometres (95.3 sq mi) and has a population of 410,419, making it the most populous local government area in Sydney. It is a member council of the Hawkesbury River County Council.

The Mayor of Blacktown City Council is Councillor Brad Bunting following the death of then-mayor Tony Bleasdale OAM, a member of the Australian Labor Party who died 3 May 2024.^{[additional citation(s) needed]}

These are the suburbs and localities in the local government area:

The first road from Prospect to Richmond became known as the "Black Town Road" and in 1860 the Railway Department gave the name of "Black Town Road Station" to the railway station at the junction of the railway and the Black Town Road, with the name shortening to "Blacktown" by 1862. The Blacktown area was first incorporated on 6 March 1906 as the "Shire of Blacktown" alongside 132 other new shires across the state as a result of the passing of the Local Government (Shires) Act, 1905. The first five-member temporary council was appointed on 15 May 1906 and first met on 20 June in the Rooty Hill School of Arts. The Blacktown Shire became the "Municipality of Blacktown" on 17 June 1961 and was granted city status on 9 March 1979, becoming the "City of Blacktown".

In 1937 Blacktown council discussed the need for new Council Chambers, with the present arrangements seen as inadequate and unable to accommodate growing staff needs. In August 1938, the council discussed two schemes from architect Leslie J. Buckland for the new council chambers, with the scheme that created a new wing facing Flushcombe Road while retaining the old council chambers for other uses being the most favoured. Designed in the modernist Inter-war Functionalist style by Buckland and constructed by J. H. Abbey of Epping at a cost of £7,000, the Council Chambers were officially opened on 29 July 1939 by the Minister for Public Works and Local Government, Eric Spooner.

By the early 1960s, Blacktown Council resolved to develop a new council seat and 'civic centre' and an International style design by Parramatta architects, Leslie J. Buckland & Druce (George Harley, project architect), for a multi-storey administration building, a performance hall, library and basement parking was accepted at a cost of £500,000. Built of concrete and brick, with decorative facade panels and glass curtain walling, the Civic Centre was constructed by S. J. Wood & Co Lty Ltd, with A. S. Nicholson as the consulting engineer.

The foundation stone for the Civic Centre was laid by Premier of NSW, Bob Heffron, on 17 June 1961, on the same occasion marking the change of Blacktown from a Shire to a Municipality. The Civic Centre was officially opened on 25 October 1965 by the Minister for Local Government and Highways, Pat Morton, with the mayor, Alfred Ashley-Brown, declaring "It is my sincere wish we will as a council cherish the heritage which brings us here tonight – that this chamber will be a place wherein good government within our sphere of responsibility will be made manifest, and that all decisions which are made shall be for the good of the people of the Municipality of Blacktown". On 10 April 1967, the old 1939 Council Chambers were transformed into the first Blacktown Municipal Library, which was later demolished and became the Max Webber Library from 1980.

In 1984, with the Civic Centre being overcrowded and suffering from lack of space, the council approved significant extensions to the Civic Centre at a cost of $2,781,550 that added 2,000 square metres of office floor space and enabled the consolidation of all council departments in a single location. The extensions were constructed by McNamara Constructions Pty Limited.