We found 71 authors for letter O
- – O. Winston Link
- – Octave Mirbeau
- – Octavia Butler
- – Octavio Paz
- – Odilon Redon
- – Og Mandino
- – Ogden Nash
- – Olga Korbut
- – Olin Miller
- – Olive Schreiner
- – Oliver Cromwell
- – Oliver Goldsmith
- – Oliver Hardy
- – Oliver Herford
- – Oliver Hudson
- – Oliver Kahn
- – Oliver North
- – Oliver Reed
- – Oliver Stone
- – Oliver Wendell Holmes
- – Oliver Wendell Holmes, Jr.
- – Olivia De Havilland
- – Olivia Newton-John
- – Olivia Wilde
- – Olivier Martinez
- – Olivier Messiaen
- – Olympia Brown
- – Olympia Snowe
- – Omar Bongo
- – Omar Epps
- – Omar Khayyam
- – Omar N. Bradley
- – Omar Sharif
- – Oprah Winfrey
- – Orhan Pamuk
- – Oriana Fallaci
- – Origen
- – Orison Swett Marden
- – Orlando Bloom
- – Orlando Jones
- – Ornette Coleman
- – Orrin Hatch
- – Orson Pratt
- – Orson Scott Card
- – Orson Welles
- – Orville Redenbacher
- – Orville Wright
- – Oscar de la Renta
- – Oscar Hammerstein II
- – Oscar Levant
- – Oscar Peterson
- – Oscar Robertson
- – Oscar Wilde
- – Oskar Schindler
- – Oskar Werner
- – Ossie Davis
- – Oswald Chambers
- – Oswald Spengler
- – Otis Blackwell
- – Otis Rush
- – Otto Dix
- – Otto Friedrich
- – Otto Schily
- – Otto von Bismarck
- – Otto Weininger
- – Ouida
- – Ovadia Yosef
- – Ovid
- – Owen D. Young
- – Owen Hart
- – Ozzie Smith