The 1909 Sewanee Tigers football team represented Sewanee: The University of the South during the 1909 Southern Intercollegiate Athletic Association football season. The team was coached by Harris G. Cope in his 1st year as head coach, compiling a record of 6–1 and outscoring opponents 160 to 42 to win the Southern Intercollegiate Athletic Association title. Sewanee beat the previous season's champions LSU and Auburn, and upset rival Vanderbilt, handing the school its first loss to a Southern team in six years.

The 1909 LSU Tigers football team represented the LSU Tigers of Louisiana State University during the 1909 college football season. The LSU team posted a 6–2 record, losing to Southern Intercollegiate Athletic Association (SIAA) champion Sewanee and to an undefeated Arkansas. Notable victories include those over Mississippi and Alabama.