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Adam Osborne Author
Al Oerter American Athlete
Alex O'Loughlin Australian Actor
Alexander O'Neal American Musician
Amos Oz Israeli Writer
Andres Manuel Lopez Obrador Mexican Politician
Andrew Oliver American Politician
Ann Oakley British Sociologist
Annette O'Toole American Dancer
Aristotle Onassis Greek Businessman
Arthur O'Shaughnessy British Poet
Ashley Olsen American Actress
Austin O'Malley American Physicist
Babatunde Olatunji Nigerian Musician
Barack Obama American President
Barbara Olson American Journalist
Barney Oliver Scientist
Baroness Orczy Hungarian Novelist
Ben Okri Nigerian Poet
Benjamin Orr American Musician
Beth Orton English Musician
Bill O'Brien British Politician
Bill O'Reilly American Journalist
Bill Owen
Bill Owens American Politician
Billy Ocean British Musician
Bob Odenkirk American Actor
Bobby Orr Canadian Athlete
Bruce Oldfield English Designer
Buck Owens American Musician
Butch Otter American Politician
Buzz Osborne American Musician
Carl Olson American Athlete
Carl Orff German Composer
Carl von Ossietzky German Activist
Carre Otis American Model
Carroll O'Connor American Actor
Catherine O'Hara Canadian Actress
Charles Olson American Poet
Charles Osgood American Journalist
Chris O'Donnell American Actor
Christine O'Donnell American Politician
Claes Oldenburg Swedish Sculptor
Clifford Odets American Playwright
Clive Owen English Actor
Conan O'Brien American Entertainer
Conor Cruise O'Brien Irish Politician
Conor Oberst American Musician
Cynthia Ozick American Novelist
Dan O'Brien American Athlete
Daniel O'Connell Irish Politician
Daniel Okrent American Editor
Daniel Ortega Nicaraguan Statesman
Dave Obey American Politician
David Obey American Politician
David Ogilvy English Businessman
David Ortiz Dominican Republican Athlete
Denise Van Outen British Actress
Donald O'Connor Musician
Donny Osmond American Musician
Doug Ose American Politician
Ed O'Brien English Musician
Ed O'Neill American Actor
Edna O'Brien Irish Novelist
Edward James Olmos American Actor
Ellen Ochoa American Astronaut
Eugene O'Neill American Dramatist
Eugene Ormandy American Musician
Flann O'Brien Irish Writer
Flannery O'Connor American Author
Frank O'Connor Irish Author
Frank O'Hara American Poet
Frank Oz American Actor
Frederick Law Olmsted American Architect
Frederick Scott Oliver
Fulton Oursler
Gary Oldman English Actor
Gene Oliver American Athlete
George Andrew Olah American Scientist
George Oppen American Poet
George Orwell British Author
Georgia O'Keeffe American Artist
Hakeem Olajuwon Nigerian Athlete
Haley Joel Osment American Actor
Harry Oppenheimer South African Businessman
Heather O'Rourke American Actress
Hermann Oberth German Scientist
Hortense Odlum
Ida Rentoul Outhwaite Australian Artist
J. Robert Oppenheimer American Physicist
Jack Osbourne English Celebrity
James Oliver British Politician
James Otis American Lawyer
Jamie Oliver British Celebrity
Jean O'Leary American Activist
Jennifer O'Neill American Actress
Jerry O'Connell American Actor
Jerry Only Musician
Jerry Orbach American Actor
Jesse Owens American Athlete
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