The head coach of a football team is one of the most impactful and important coaches in the sports world, especially when it comes to college football. Many innovations that changed the game started in college. Whether it's the forward pass that was pioneered by Knute Rockne at Notre Dame or the "run-pass options" in the modern game, college coaches are vital to football. But which college coaches innovated and inspired their teams to victory the most? These are the greatest college football coaches of all time. Note: Rankings are based on winning percentage through the 2019 season at Football Bowl Subdivision schools (formerly Division I-A) or equivalent, with a minimum of 10 years coaching. Data source is College Football Reference.