• O Connor, Flannery
• O'Connell, Daniel
• O'Malley, Austin
• O'Neill
• O'Neill, Eugene
• Oakley, Ann
• Oldham, Glenna
• Oliver, James
• Olson, Merlin
• Onasander
• Onassis, Aristotle
• Oneida
• Oppenheimer, Robert
• Orben, Robert
• Oriental Proverb
• Ortega, Jose
• Orwell, George
• Osborn, Ronald E.
• Oscar II of Sweden
• Osgood, Samuel
• Osler, William
• Osner, George
• Otway
• Ouida
• Ovejune, Fuente
• Overbury, Thomas
• Overstreet, Harry A.
• Ovid
• Ozbourne, Ozzy