John Albert Beasley was an Australian politician who was a member of the House of Representatives from 1928 to 1946. He served in the Australian War Cabinet from 1941 to 1946, and was a government minister in the Curtin and Chifley governments. Beasley was a member of the Australian Labor Party, although on two occasions he left the party to join the breakaway Lang Labor groups, leading the faction in federal parliament. He concluded his career as High Commissioner to the United Kingdom from 1946 until his death in 1949.

Lang Labor was a faction of the Australian Labor Party (ALP) consisting of the supporters of Jack Lang, who served two terms as Premier of New South Wales and was the party's state leader from 1923 to 1939. It controlled the New South Wales branch of the ALP throughout most of the 1920s and 1930s. The faction broke away to form separate parliamentary parties on several occasions and stood competing candidates against the ALP in state and federal elections.