| Biographical details | |
|---|---|
| Born | January 27, 1875 Ann Arbor, Michigan, U.S. |
| Died | October 6, 1958 (aged 83) Washtenaw County, Michigan, U.S. |
| Playing career | |
| 1896 | Michigan |
| Position(s) | Fullback |
| Coaching career (HC unless noted) | |
| 1895 | Alma |
| 1897 | Michigan (assistant) |
| Head coaching record | |
| Overall | 3–1 |
Ignatius Michael Duffy (January 27, 1875 – October 6, 1958) was an American football coach. He served as the head coach at Alma College in 1895 and as an assistant coach at the University of Michigan in 1897. He played college football for one season at Michigan.