Richard Walther Siebert (February 19, 1912 – December 9, 1978) was an American first baseman in Major League Baseball who had an 11-year career from 1932, 1936–1945. He played for the Brooklyn Dodgers and St. Louis Cardinals, both of the National League, and the Philadelphia A's of the American League. He was elected to the American League All-Star team in 1943. Born in Fall River, Massachusetts, he grew up in Cass Lake and Saint Paul, Minnesota.