| Ion Cortright | |
| Birth Date: | 29 June 1889 |
| Birth Place: | Eaton County, Michigan, U.S. |
| Death Place: | East Lansing, Michigan, U.S. |
| Player Sport1: | Football |
| Player Years2: | 1907–1910 |
| Player Team2: | Michigan Agricultural |
| Player Positions: | Halfback |
| Coach Sport1: | Football |
| Coach Years2: | 1911–1913 |
| Coach Team2: | Michigan Agricultural (assistant) |
| Coach Years3: | 1914–1915 |
| Coach Team3: | South Dakota |
| Coach Years4: | 1916 |
| Coach Team4: | Cincinnati |
| Coach Years5: | 1925–1927 |
| Coach Team5: | North Dakota Agricultural |
| Coach Sport6: | Basketball |
| Coach Years7: | 1914–1915 |
| Coach Team7: | South Dakota |
| Coach Years8: | 1916–1917 |
| Coach Team8: | Cincinnati |
| Coach Years9: | 1925–1926 |
| Coach Team9: | North Dakota Agricultural |
| Overall Record: | 22–20–6 (football) 38–14 (basketball) |
| Championships: | Football 1 NCC (1925) |
Ion John Cortright (June 29, 1889 – June 3, 1961)[1] was an American football player and coach of football and basketball. He served as the head football coach at the University of South Dakota (1914–1915), the University of Cincinnati (1916), and North Dakota Agricultural College, now North Dakota State University, (1925–1927), compiling a career college football record of 22–20–6. Cortright was also the head basketball coach at South Dakota for one season in 1914–15, Cincinnati for one season in 1916–17, and North Dakota Agricultural for one season in 1925–26, tallying a career mark of 38–14.