The 1903 Sewanee Tigers football team represented the Sewanee Tigers of Sewanee: The University of the South in the 1903 season. 1903 met difficulty in determining an SIAA champion. Clemson had the best record, but lost to an inferior North Carolina team; and in the game to secure the SIAA title were tied by Cumberland. Clemson's John Heisman pushed strongly for Cumberland to share the SIAA title. Cumberland's strongest victory was its win over Vanderbilt. However, Sewanee beat Cumberland, yet suffered its only loss to Vanderbilt. Therefore, one can find all of Clemson, Cumberland, Sewanee, and Vanderbilt defended as SIAA champion.