Joyce Carol Oates
Edna O'Brien
Tim O'Brien
Sean O'Casey
Edwin O'Connor
Flannery O'Connor
John Cardinal O'Connor
Sandra Day O'Connor
John O'Hara
Shaquille O'Neal
Tatum O'Neal
Buck O'Neill
Eugene O'Neill
Joseph O'Neill
President Barack Obama
George Obama
Michael Ondaatje
Iona Opie (editor)
Baroness Orczy
George Orwell
Charles Osgood
David Oshinsky
Ovid