James O'Leary may refer to:
*
James A. O'Leary
James Aloysius O'Leary (April 23, 1889 – March 16, 1944) was an American lawyer and businessman who served five terms as a Democratic Party (United States), Democratic member of the United States House of Representatives from New York (state), ...
(1889–1944), American congressman
*
James Patrick O'Leary (1869–1925), American gambler
{{hndis, Oleary, James