The 1920 Notre Dame Fighting Irish football team was an American football team that represented the University of Notre Dame as an independent during the 1920 college football season. In their third year under head coach Knute Rockne, the team compiled a perfect 9–0 record and outscored opponents by a total of 251 to 44.

The 1920 college football season had no clear-cut champion, with the Official NCAA Division I Football Records Book listing California, Georgia, Harvard, Notre Dame, and Princeton as national champions. Only California and Princeton claim national championships for the 1920 season. Andy Smith's Pacific Coast Conference champion California "Wonder Team" was the first national champion from the Pacific Coast. Princeton and Harvard were undefeated and with one tie to each other. Notre Dame was led by its first Walter Camp All-American, George Gipp, who died before the year was over.