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.

Born in Fall River, Massachusetts, he grew up in Cass Lake and Saint Paul, Minnesota.

Following his playing career, Siebert became head baseball coach at the University of Minnesota in 1948, where he would remain until his death.

He finished with a 754–361–6 record and a .676 winning percentage, far and away the most in school history at the time; he has since been passed by current coach John Anderson.

This arrangement allowed Siebert to evaluate talent and coach his Gophers players during the collegiate off-season.