Ronald J. Kramer (June 24, 1935 – September 11, 2010) was a multi-sport college athlete and professional American football player. Before embarking on a career in the National Football League, he lettered in football, basketball, and track at the University of Michigan in the 1950s. Playing at end for the Michigan Wolverines football team from 1954 to 1956, Kramer was a three-time All-American. Following his days at Michigan, Kramer was selected in the first round of the 1957 NFL Draft by the Green Bay Packers. He played for the Packers for seven seasons (1957, 1959–1964) and three more with the Detroit Lions (1965–1967). Kramer was inducted into the College Football Hall of Fame in 1978. His football jersey number at Michigan (#87) was retired upon his graduation.