The 1909 Southern Intercollegiate Athletic Association football season was the college football games played by the member schools of the Southern Intercollegiate Athletic Association as part of the 1909 college football season. The season began on September 25.
Under head coach Harris G. Cope, Sewanee won its last conference title in major college football. Sewanee gave Vanderbilt its first loss to a Southern team in six years, and was the first Sewanee squad to win a title since the 1899 Iron Men.
When the Kentucky team was welcomed home after the upset win over Illinois, Philip Carbusier said that they had "fought like wildcats", a nickname that stuck.
President Taft showed up for the Sewanee-LSU game. LSU was led by Hall of Fame quarterback Doc Fenton.