Authors starting with O
- O. Henry36
- Odilo Globocnik6
- Oliver Cromwell96
- Oliver Goldsmith91
- Oliver Hazard Perry10
- Oliver Wendell, Jr. Holmes7
- Oliver Wendell, Sr. Holmes7
- Olof Palme8
- Omar Bradley8
- Omar Khayyam87
- Oprah Winfrey48
- Orhan Pamuk1
- Orlando Bloom19
- Orlando Jones6
- Orson Scott Card1116
- Orson Welles34
- Osama bin Laden24
- Oscar Niemeyer12
- Oscar Wilde252
- Osho40
- Osip Mandelstam2
- Oswald Chambers2
- Oswald Pohl13
- Otto Skorzeny11
- Ovid100
- Owain Owain2
- Ozzy Osbourne92