Matthew Emory Hazeltine, Jr. (August 2, 1933 – January 13, 1987) was a professional American football linebacker who played fifteen seasons in the National Football League with the San Francisco 49ers and New York Giants. Hazeltine was a 1951 graduate of Tamalpais High School in Mill Valley, California, and was a star player there and at the University of California, Berkeley. He was elected to the College Football Hall of Fame in 1989. While with the 49ers, Hazeltine was selected for the Pro Bowl twice, in 1963 and 1965. He was captain of the team for five years.