John Knauf (April 5, 1868 – September 19, 1952) was an American judge who served as a Justice of the Supreme Court of North Dakota in 1906. He was first appointed to the court in 1906 after justice Newton C. Young resigned, and he did not win re-election later that year, making his tenure of four and one half months on the court the shortest in North Dakota history. He died in Fargo, North Dakota in 1952 at age 84.
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