Peter Michael Manley (born February 14, 1942, in Wausau, Wisconsin) is a retired middle- and long-distance runner from the United States. He twice won the gold medal in the men's 3.000 metres steeplechase event at the Pan American Games: 1971 and 1975. Manley represented his native country at the 1972 Summer Olympics in Munich, West Germany. He was the 1969 AAU steeplechase champion while competing for the Southern California Striders and competed for the University of Wisconsin–Madison and the Oregon Track Club.