Orson Welles

actor

Orson Scott Card

novelist

Orrin Woodward

author

Orosius

Orlando Bloom

actor

Origen

scholar

Oriah Dreamer

writer

Orhan Pamuk

novelist

Oren Lyons

lacrosse-player

Oprah Winfrey

media-proprietor

Onew

singer

Larry Wall

programmer

Larry Merchant

sportswriter

Omar Torrijos

elected-official

Olympia Dukakis

actress

Olivier Clement

Olivia Wilde

actress

Oliver Wendell Holmes Sr.

physician

Oliver Wendell Holmes, Jr.

former-associate-justice-of-the-supreme-court-of-the-united-states

Oliver Sacks

neurologist