List of high school football rivalries more than 100 years old

There are several dozen high school football rivalries in the United States that are more than 100 years old. The oldest ongoing rivalry is between two Connecticut high schools, Norwich Free Academy in Norwich and New London High School in New London. The ongoing annual rivalry between Norwich Free Academy and New London High School began in 1875, though it has not been played continuously due to games not played during World War I. As of 2023, the most-played among these rivalries is one between two schools in Hawaii, Punahou and Kamehameha in Honolulu, HI, first played in 1903. The schools often play each other multiple times a year due to post-season match-ups, currently at 195 games.