The Municipality of Newtown was a local government area of Sydney, New South Wales, Australia. The municipality was proclaimed as a borough in 1862 and, with an area of 1.9 square kilometres, was centred on the suburb of Newtown, including parts of Erskineville and Enmore. The municipality was divided into four wards: Kingston, Enmore, O'Connell and Camden. In 1949 under the Local Government (Areas) Act 1948, Newtown Municipal Council was merged with the larger neighbouring City of Sydney which was located immediately to the North, although parts were subsequently, from 1968, moved into Marrickville Council. Mayors included Lilian Fowler (1938–1939), the first female mayor in Australia.

Newtown, a suburb of Sydney's inner west, is located approximately four kilometres south-west of the Sydney central business district, straddling the local government areas of the City of Sydney and Inner West Council in the state of New South Wales, Australia.