Donn Barber FAIA (October 19, 1871 – May 29, 1925) was an American architect.

[3] He studied at Holbrook Military Academy in Ossining, New York, and graduated from Yale University in 1893, where he was chairman of the campus humor magazine, The Yale Record,[4] and a member of the Berzelius Society.

After Yale, he took post-graduate architectural courses at Columbia University, and at the École des Beaux-Arts in Paris under Paul Blondell and Scellier de Gisors.

After returning to America, he apprenticed in the offices of Carrere & Hastings, Cass Gilbert and Lord & Hewlett.

In 1923, Barber was elected an Associate member of the National Academy of Design.