Bill O'Brien British(1929-)
Conan O'Brien American(1963-)
Conor Cruise O'Brien Irish(1917-2008)
Dan O'Brien American(1966-)
Ed O'Brien English(1968-)
Edna O'Brien Irish(1932-)
Flann O'Brien Irish(1911-1966)
Kate O'Brien Irish(1897-1974)
Margaret O'Brien American(1937-)
Richard O'Brien English(1942-)
Soledad O'Brien (1966-)
Sean O'Casey Irish(1880-1964)
Daniel O'Connell Irish(1776-1847)
Jerry O'Connell American(1974-)
William H. O'Connell American(1859-1944)
Carroll O'Connor American(1922-2001)
Donald O'Connor (1925-2003)
Flannery O'Connor American(1925-1964)
Frank O'Connor Irish(1903-1966)
John J. O'Connor (-)
Renee O'Connor American(1971-)
Sandra Day O'Connor American(1930-)
Sinead O'Connor Irish(1966-)
Nancy O'Dell American(1963-)
Chris O'Donnell American(1970-)
Christine O'Donnell American(1969-)
Rosie O'Donnell American(1962-)
Michael O'Donoghue American(1940-1994)
Sean O'Faolain Irish(1900-1991)
Paul O'Grady English(1955-)
Madalyn Murray O'Hair American(1919-1995)
Catherine O'Hara Canadian(1954-)
Frank O'Hara American(1926-1966)
John O'Hara American(1905-1970)
Maureen O'Hara Irish(1920-)
Jodi Lyn O'Keefe American(1978-)
Georgia O'Keeffe American(1887-1986)
Jean O'Leary American(1948-2005)
Alex O'Loughlin Australian(-)
Austin O'Malley American(1858-1932)
Alexander O'Neal American(1953-)
Shaquille O'Neal American(1972-)
Tatum O'Neal American(1963-)
Nance O'Neil (-)
Ed O'Neill American(1946-)
Eugene O'Neill American(1888-1953)
Jennifer O'Neill American(1948-)
John O'Neill (1968-)
Paul O'Neill American(1935-)
Thomas P. O'Neill American(1912-1994)
Bill O'Reilly American(1949-)
Tim O'Reilly (-)
Heather O'Rourke American(1975-1988)
P. J. O'Rourke American(1947-)
Arthur O'Shaughnessy British(1844-1881)
Annette O'Toole American(1952-)
John O'Toole Canadian(-)
Peter O'Toole Irish(1932-)
Paul Oakenfold (1963-)
Ann Oakley British(1944-)
John Oates American(1948-)
Johnny Oates American(1946-2004)
Joyce Carol Oates American(1938-)
Barack Obama American(1961-)
Michelle Obama American(1964-)
Olusegun Obasanjo Nigerian(1937-)
Merle Oberon American(1911-1979)
Conor Oberst American(1980-)
Hermann Oberth German(1894-1989)
Dave Obey American(1938-)
David Obey American(1938-)
Andres Manuel Lopez Obrador Mexican(1953-)
Ric Ocasek (1949-)
William of Occam English(1285-1349)
Billy Ocean British(1950-)
Ellen Ochoa American(1958-)
Phil Ochs American(1940-1976)
Ann Oddy (-)
Bob Odenkirk American(1962-)
Clifford Odets American(1906-1963)
Steve Odland (-)
Hortense Odlum (-)
William Odom American(1932-2008)
Kenzaburo Oe Japanese(1935-)
Roger von Oech (-)
Al Oerter American(1936-2007)
David Ogilvy English(1911-1999)
Sadaharu Oh Japanese(1940-)
Sandra Oh Canadian(1971-)
Daniel Okrent American(1948-)
Ben Okri Nigerian(1959-)
George Andrew Olah American(1927-)
Hakeem Olajuwon Nigerian(1963-)
Marvin Olasky American(1950-)
Babatunde Olatunji Nigerian(1927-2003)
Keith Olbermann American(1959-)
Claes Oldenburg Swedish(1929-)
Bruce Oldfield English(1950-)
Mike Oldfield English(1953-)
John Oldham American(1592-1636)
Will Oldham American(1970-)
Gary Oldman English(1958-)
Sharon Olds American(1942-)
Larisa Oleynik American(1981-)
Margaret Oliphant Scottish(1828-1897)
Mark Oliphant Australian(1901-2000)
Pat Oliphant Australian(1935-)
Tony Oliva American(1940-)
Andrew Oliver American(1706-1774)
Barney Oliver (1909-1995)
Frederick Scott Oliver (-)
Gene Oliver American(1935-)
James Oliver British(-)
Jamie Oliver British(1975-)
Mary Oliver American(1935-)
Peter Oliver English(1908-1908)
Susan Oliver American(1932-1990)
Laurence Olivier English(1907-1989)
Edward James Olmos American(1947-)
Frederick Law Olmsted American(1822-1903)
Ashley Olsen American(1986-)
Ken Olsen American(1926-)
Mary-Kate Olsen American(1986-)
Merlin Olsen American(1940-2010)
Susan Olsen American(1961-)
Tillie Olsen American(1913-2007)
Barbara Olson American(1955-2001)
Carl Olson American(1928-2002)
Charles Olson American(1910-1970)
Johnny Olson American(1910-1985)
Ted Olson American(1940-)
John Olver American(1936-)
Timothy Olyphant American(1968-)
Mohammed Omar Afghani(-)
Aristotle Onassis Greek(1906-1975)
Jacqueline Kennedy Onassis (-)
Michael Ondaatje Canadian(1943-)
Jerry Only (1959-)
Yoko Ono American(1933-)
John Opie English(1761-1807)
George Oppen American(1908-1984)
Joanne E. Oppenheim (-)
Tom Oppenheim (-)
Harry Oppenheimer South African(1908-2000)
J. Robert Oppenheimer American(1904-1967)
Jerry Orbach American(1935-2004)
Susie Orbach (-)
Robert Orben American(1927-)
Roy Orbison American(1936-1988)
Baroness Orczy British(1865-1947)
Carl Orff German(1895-1982)
Tony Orlando American(1944-)
Suze Orman American(1951-)
Eugene Ormandy American(1899-1985)
Julia Ormond British(1965-)
Leo Ornstein American(1892-2002)
Jose C. Orozco (-)
Benjamin Orr American(1947-2000)
Bobby Orr Canadian(1948-)
John Boyd Orr Scottish(1880-1971)
Leonard Orr American(1938-)
Stacie Orrico American(1986-)
Peter Orszag American(1968-)
Daniel Ortega Nicaraguan(1945-)
David Ortiz Dominican Republican(1975-)
Solomon Ortiz American(1937-)
Beth Orton English(1970-)
Joe Orton English(1933-1967)
George Orwell British(1903-1950)
Adam Osborne (1939-2003)
Buzz Osborne American(1964-)
John Osborne English(1929-1994)
Tom Osborne American(1937-)
Jack Osbourne English(1985-)
Kelly Osbourne English(1984-)
Ozzy Osbourne English(1948-)
Sharon Osbourne English(1952-)
Doug Ose American(1955-)
Charles Osgood American(1933-)
William Osler Canadian(1849-1919)
Haley Joel Osment American(1988-)
Donny Osmond American(1957-)
Marie Osmond American(1959-)
Carl von Ossietzky German(1889-1938)
Joel Osteen American(1963-)
Wilhelm Ostwald German(1853-1932)
Lee Harvey Oswald American(1939-1963)
Marguerite Oswald (-)
Marina Oswald Russian(1939-1963)
Patton Oswalt American(1969-)
Carre Otis American(1968-)
James Otis American(1725-1783)
Mel Ott American(1909-1958)
Butch Otter American(1942-)
Jim Otto American(1938-)
John Otto American(1977-)
Miranda Otto Australian(1967-)
Rudolf Otto German(1869-1937)
John Otway (-)
Thomas Otway English(1652-1685)
Fulton Oursler (-)
Denise Van Outen British(1975-)
Ida Rentoul Outhwaite Australian(1888-1960)
Thomas Overbury English(1581-1613)
Bill Owen (1914-1999)
Clive Owen English(1964-)
John Owen English(1616-1683)
Michael J. Owen English(1979-)
Richard Owen English(1804-1892)
Robert Dale Owen Scottish(1801-1877)
Robert Owen Welsh(1771-1858)
Wilfred Owen English(1893-1918)
Bill Owens American(1950-)
Buck Owens American(1929-2006)
Jesse Owens American(1913-1980)
Major Owens American(1936-)
Major R. Owens American(1936-)
Terrell Owens American(1973-)
John Oxenham British(1852-1941)
Michael Oxley American(1944-)
Amos Oz Israeli(1939-)
Frank Oz American(1944-)
Cynthia Ozick American(1928-)