Ion John Cortright (June 29, 1889 – June 3, 1961) 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 1914–1915, Cincinnati for one season in 1916–1917, and North Dakota Agricultural for one season in 1925–1926, tallying a career mark of 38–14.