Frederick Mortimer "Cap" Irish (May 16, 1870 – April 12, 1941) was an American football coach, college athletics administrator, and science instructor.

He served as the first head football coach at the Territorial Normal School, renamed Tempe Normal School in 1903 and now known as Arizona State University, coaching from 1897 to 1906 and compiling a record of 12–8.

Irish Field one of the original homes of Arizona State Football was also named after the coach and administrator.

[1] Irish graduated from the University of Iowa in 1895 with a Bachelor of Science degree.

[2] Irish died at a hospital in Tempe, Arizona, on April 12, 1941.