Reginald John Rudall (27 September 1885 – 1 January 1955) was a lawyer and politician in Gawler, South Australia. His father, Samuel Bruce Rudall, was member for Barossa 1906–1915.
Reginald Rudall was born at Gawler, the son of Samuel Bruce Rudall (1859–1945) and Margaret Rudall, née McNeil. He was educated at Miss Burton's Private School in Gawler, Queen's School in North Adelaide, and St. Peter's College. He read law at the University of Adelaide then served his articles with his father firm of Rudall & Rudall and in the firm G. & J. Downer. He was admitted to the Bar in 1907. In 1908 he was awarded a Rhodes scholarship, which he used to further his studies at Oxford University.
He enlisted in the AIF in 1915 and served with the 50th Battalion in France. In September 1918 he was appointed assistant director of the newly formed AIF Education Service in London, where he was promoted to the rank of captain shortly before in May 1919 returning to Australia.
He returned to Gawler, where he rejoined his father's firm of Rudall & Rudall and lectured in Constitutional Law at the University of Adelaide from 1920 to 1925. He was elected to the House of Assembly at a July 1933 by-election in the seat of Barossa. In 1938, when the House of Assembly moved from multi-member to single-member districts, he contested and won the new seat of Angas. Thomas Playford became premier in the following November and appointed Rudall to his cabinet as Commissioner of Crown Lands (1938–1944), Minister of Repatriation and Minister of Irrigation (1938–1946) and Minister of Lands (1944–1946).