James Patrick Digger Dunn (born James Patrick Dunn; 20 August 1887 – 21 November 1945) was an Australian politician who served as a Senator for New South Wales from 1929 to 1935. He was elected as a member of the Australian Labor Party (ALP), but after the 1931 party split joined the breakaway Lang Labor faction. He was one of only two Lang Labor senators, but was designated as the party's Senate leader. Dunn was a trade unionist and World War I soldier before entering politics. He was a perennial candidate for state and federal office between 1919 and 1945, but won only a single election.