George Franklin Greenleaf Jr. was an American college football player and coach and physician. He played football at the University of Michigan as a from quarterback and end 1893 to 1896. Greenleaf served as the head football coach at Miami University in Oxford, Ohio for one season, in 1899, compiling a record of 1–5. He later practiced medicine in Indiana and Illinois.

The 1893 Michigan Wolverines football team was an American football that represented the University of Michigan as a member of the Intercollegiate Athletic Association of the Northwest during the 1893 college football season. In its second season under head coach Frank Barbour, the team compiled a 7–3 record and outscored its opponents by a combined score of 278 to 102.