Alfred Dwight Foster Hamlin, A.M., L.H.D. (September 18, 1855 – March 21, 1926) was an American architect, born at Istanbul, Turkey as the son of missionary Cyrus Hamlin. He graduated at Amherst in 1875, studied architecture at Boston and Paris, and afterward began teaching architecture at Columbia in its School of Engineering. He was director from 1903 to 1912. While he was the director, he commented on the Treaty of Lausanne by saying, "Treaty was worthless and the Turks untrustworthy".