John Sebastion Grogan (September 24, 1880 – October 22, 1952) was an American college football player and coach.
He played football at Knox College in Galesburg, Illinois from 1900 to 1903, where he dropkicked a 55-yard field goal in an upset win over the Illinois Fighting Illini.
[1] Grogan served as the head football, basketball and baseball coach at the University of Idaho in Moscow, Idaho during the 1909–10 academic year.
[2] # denotes interim head coach # denotes interim head coach