George Thomas Seward (c. 1851 – March 28, 1904) was an American 19th-century professional baseball player and umpire.
Seward played for the St. Louis Brown Stockings of the National Association in and the New York Mutuals of the National League in . He also played one season for the St. Louis Brown Stockings of the American Association in .
In 1876 through 1878, Seward umpired a total of 21 games in the National League. In 1884, he umpired 54 games in the American Association, and 33 games in the Union Association.