Russell Keith McCormmach (born 9 October 1933), the husband of the late Christa Jungnickel, is an American historian of physics. McCormmach grew up in Walla Walla, Washington and studied physics at Washington State College with bachelor's degree in 1955. As a Rhodes scholar, he studied politics, philosophy and economics at Oxford University with bachelor's degree in 1959. He then worked as an electronics engineer at Bell Laboratories. In 1967 he received a Ph.D. in the history of science from Case Institute of Technology under Martin J. Klein. McCormmach was then a professor of the history of science at the University of Pennsylvania and the Johns Hopkins University (until 1983), and then at the University of Oregon. There he is a professor emeritus.