| Jack Harrison | |
| Birth Date: | 30 January 1875 |
| Birth Place: | Minnesota, U.S. |
| Death Place: | Arcola, Minnesota, U.S. |
| Alma Mater: | Minnesota Law (1899, LLB) |
| Player Years1: | 1894–1897 |
| Player Team1: | Minnesota |
| Player Positions: | End |
| Coach Years1: | 1899 |
| Coach Team1: | Minnesota |
| Coach Years2: | 1900–1901 |
| Coach Team2: | North Dakota Agricultural |
| Overall Record: | 21–4–3 |
John Martin "Hinkey" Harrison (January 30, 1875 – September 19, 1952) was an American college football coach and player. He served as the head football coach at the University of Minnesota in 1899 and North Dakota Agricultural College—now known as North Dakota State University–from 1900 to 1901, compiling a career coaching record of 21–4–3.[1] [2]