John Hipple Mitchell, also known as John Mitchell Hipple, John H. Mitchell, or J. H. Mitchell (June 22, 1835 – December 8, 1905) was an American lawyer, politician, and convicted criminal. He served as a Republican United States Senator from Oregon on three occasions between 1873 and 1905. He also served as president of the state senate, did the initial legal work involved in the dispute that led to the landmark Supreme Court case of Pennoyer v. Neff, and later was involved with the Oregon land fraud scandal, for which he was indicted and convicted while a sitting U.S. Senator. He is one of twelve U.S. Senators indicted while in office, and one of five convicted.