John Thomas "Jack" Lang was an Australian Labor Party politician who served as the 23rd Premier of New South Wales from 1925 to 1927 and again from 1930 to 1932. He was dismissed by the Governor of New South Wales, Sir Philip Game, at the climax of the 1932 constitutional crisis and resoundingly lost the resulting election and subsequent elections as Leader of the Opposition. He later formed a splinter party and was briefly a member of the Australian House of Representatives.