Horace Ashenfelter, III (born January 23, 1923) is a retired Americanathlete. He competed in international athletics from 1947 to 1956 after service in World War II and the completion of his degree at Penn State, where he was a member of Delta Upsilon fraternity. Ashenfelter was born in Collegeville, Pennsylvania. During his career he won fifteen national AAU titles and three collegiate national titles.
Ashenfelter won the Millrose Games two-mile run from 1952 to 1955 and again in 1957. His best winning time was in 1954 at 8:53.3. He was inducted into the Millrose Games Hall of Fame in 2001 as a five-time champion.