- Orson Scott Card
- Ovid
- Owen Johnson
- Orhan Pamuk
- Oprah Winfrey
- Oscar Wilde
- Oscar Hijuelos
- Octavio Paz
- O. Henry
- Olivier Todd
- Olivia Manning
- Orion
- Ori Brafman
- Otto Penzler
- Oliver Harris
- Othniel Charles Marsh
- Orison Swett Marden
- Og Mandino
- Oliver Ho
- Orlando Figes
- Oriana Fallaci
- Okakura Kakuzō
- Os Guinness
- Oliver James
- Osamu Tezuka
- Octavia E. Butler
- Omer Bartov
- Olivier Weber
- Owen Davies
- Ogden Nash
- Olive Thorne Miller
- Oswald Chambers
- Oz Clarke
- Oscar Peterson
- Oakley Hall
- O. Palmer Robertson
- Olivier Roy
- Orville Schell
- Omair Ahmad
- Oleg Cassini
- Olive Ann Burns
- Octavius Winslow
- Oliver North
- Olivier J. Blanchard
- Olive Schreiner
- Osip Mandelstam
- Olaf Stapledon
- Olivier Assayas
- Oliver Goldsmith
- Orson Welles
- Ousmane Sembène
- Ozzy Osbourne
- Oliver Butterworth
- Olga Grushin
- Otto Kroeger
- Osama bin Laden
- Ota Pavel
- Omar Tyree
- Os Hillman
- Oswald Spengler
- Oscar Zeta Acosta
- Osha Gray Davidson
- Olivia Goldsmith
- Owen Chase
- Ossie Davis
- Owen Wister
