Frank William Kellert (July 6, 1924 – November 19, 1976) was an American professional baseball player. The first baseman appeared in 122 games over all or parts of four major league seasons between 1953 and 1956 for the St. Louis Browns / Baltimore Orioles, Brooklyn Dodgers and Chicago Cubs. He was a member of the 1955 world champion Dodgers, the only Brooklyn team to win a World Series. Kellert threw and batted right-handed, and was listed at 6 feet, 21⁄2 inches (1.89 m) tall and 185 pounds (84 kg).