Thomas Gordon Seaton (August 30, 1887 – April 10, 1940) was a pitcher in Major League Baseball from 1912-1917. He was signed in 1909 as a pitcher by the Portland, Oregon baseball team in the Pacific Coast League. In 1910 he was part of a pitching staff that included Gene Krapp, Jack Graney, Bill Steen and Vean Gregg. The Philadelphia Phillies drafted Seaton in 1912. After the Federal League folded after the 1915 season, Seaton pitched for the Chicago Cubs. He eventually was released and returned to the Pacific Coast League. He died on April 10, 1940.