William Peter Barry (30 June 1899 – 21 December 1972) was a Member of the Victorian Legislative Assembly for the Electoral district of Carlton from July 1932 until April 1955. Barry was a member of the Labor Party until March 1955, when he was expelled from the party as part of the Australian Labor Party split of 1955. He became, with Les Coleman in the Victorian Legislative Council, joint leader of the Australian Labor Party (Anti-Communist), a party that in 1957 became the Democratic Labor Party.