Balmain is an electoral district of the Legislative Assembly of the Australian state of New South Wales in Sydney's Inner West.

In 1920, parts of the electoral districts of Balmain, Annandale, Camperdown, Darling Harbour, Glebe and Rozelle were combined to create a new incarnation of Balmain, which elected five members by proportional representation.

This was replaced by single member electorates of Balmain, Annandale, Glebe and Rozelle for the 1927 election.

It was recreated for the 2007 election, taking in large parts of the abolished district of Port Jackson (the Sydney CBD and Pyrmont, which were previously in Port Jackson, became part of the new Electoral district of Sydney).

Historically, Balmain has been a working-class seat and very safe for Labor—at the 1978 election, Labor won an 84.2 percent two-party vote.