John Elmore "Jack" Musick (c. 1925 – November 27, 1977) was an American football player and coach. He served as the head football coach at Cornell University from 1966 to 1974. Musick played as a lineman at the University of Southern California from 1944 to 1946. In 1947 he became an assistant coach under Bob Blackman at Monrovia High School in Monrovia, California and then followed him to Pasadena City College in 1949. In 1951 Musick became head coach at Hart High School. In 1953 he rejoined Bob Blackman at Denver University where he served as head line coach. Musick worked in that capacity under Blackman for the next 13 years, including 11 after 1955 when both were hired by Dartmouth College. Dartmouth won four Ivy League titles with Musick coaching under Blackman.