Harold Kelley (February 16, 1921 – January 29, 2003) was an American social psychologist. He was born in Boise, Idaho. He was professor of psychology at the University of California, Los Angeles. His major works were the development of interdependence theory (with John Thibaut). A "Review of General Psychology" survey, published in 2002, ranked Kelley as the 43rd most cited psychologist of the 20th century.