The Municipality of Balmain was a local government area of Sydney, New South Wales, Australia.
The council was amalgamated with the municipalities of Leichhardt and Annandale to the south with the passing of the Local Government (Areas) Act 1948.
[2] The council first met on 5 April 1860 in the loft of a warehouse owned by Councillor Thomas Rowntree on Mort Bay (now the site of Gilchrist Place), then to rooms rented on the western side of Adolphus Street and thereafter in St Mary's schoolroom at 7 Adolphus Street.
[9] By the end of the Second World War, the NSW Government had come to the conclusion, following the recommendation of the 1945–46 Clancy Royal Commission on Local Government Boundaries, that its ideas of infrastructure expansion could not be realised by the present system of the mostly-poor inner-city municipal councils and the Minister for Local Government, Joseph Cahill, pushed through a bill in 1948 that abolished a significant number of those councils.
Balmain was abolished and amalgamated with Annandale into the Municipality of Leichhardt following the enactment of the Local Government (Areas) Act 1948, which came into effect from 1 January 1949.