Robert Cullen Mahan (February 6, 1904 – March 5, 2000) was an American football player.
Mahan was born in 1904 in Emmetsburg, Iowa. He attended high school in Emmetsburg and then enrolled at Drake University in Des Moines. He played college football for Drake's freshman team in 1922 and for the varsity team in 1923. He transferred to Washington University of St. Louis where he continued to play college football from 1924 to 1926.[1] He was selected as captain of the 1927 Washington University Bears football team.[2][3]