Arthur Aloysius O'Leary SJ (September 27, 1887 – February 8, 1962) was an American Catholic priest and Jesuit, who served as president of Georgetown University in from 1935 to 1942. Born in Washington, D.C., he studied at Gonzaga College before entering the Society of Jesus and continuing his education at St. Andrew-on-Hudson and Woodstock College. He then taught at St. Andrew-on-Hudson and Georgetown University, where he eventually became the university's librarian, and undertook a major improvement of the Georgetown University Library. O'Leary then assumed the presidency of the university in the midst of the Great Depression and, later, World War II.