| Sport(s) | Football, baseball |
|---|---|
| Current position | |
| Title | Defensive coordinator (football) |
| Team | Central Michigan |
| Conference | MAC |
| Biographical details | |
| Born | February 25, 1952 |
| Playing career | |
| Football | |
| 1971–1973 | Illinois |
| Baseball | |
| 1972–1974 | Illinois |
| Position(s) | Linebacker (football) |
| Coaching career (HC unless noted) | |
| Football | |
| 1974 | Illinois (GA) |
| c. 1975 | Marshall High School (IL) (assistant) |
| 1979–1981 | Schlarman Academy (IL) |
| 1982–1986 | Naperville Central HS (IL) |
| 1987 | Michigan State (GA) |
| 1988–1994 | Illinois (assistant) |
| 1995–1997 | Michigan State (assistant) |
| 1998–2001 | Kent State (DC) |
| 2002–2007 | Northwestern (DC) |
| 2008–2012 | Millersville |
| 2013–2014 | Illinois (DL) |
| 2015–present | Central Michigan (DC) |
| Baseball | |
| 1978–1980 | Illinois (assistant) |
| Head coaching record | |
| Overall | 11–44 (college) |
Greg Colby (born February 25, 1952) is an American football coach. He is the defensive coordinator at Central Michigan University, a position he has held since 2015. Colby served as the head football coach at Millersville University of Pennsylvania from 2008 to 2012, compiling a record of 11–44. He was the defensive coordinator at Kent State University from 1998 to 2001 and at Northwestern University from 2002 to 2007.