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.

After struggling through a mediocre season in 1912, Seaton became a dominating pitcher in 1913 appearing in 52 games and compiling a 27–12 record in 322.1 innings.

After a dispute involving his wife and the Phillies, Seaton signed with the Brooklyn Tip-Tops of the Federal League.