Klaus F. Riegel (November 6, 1925 in Berlin, Germany – July 3, 1977 in Ann Arbor, United States) was professor of psychology at the University of Michigan from 1959 to 1977. His research and theory contributions encompassed psycholinguistics, gerontology, developmental psychology, and dialectical psychology. Riegel edited the international journal ''Human Development'' from 1970 to 1977. In 1975, the Gerontological Society of America presented Riegel with the Robert W. Kleemeier Award for outstanding research in the field of gerontology.
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