Benjamin Orr (Musician, 1947—2000) - 2 quotes
Ovid (Poet) - 121 quotes
Adam Osborne (Author, 1939—2003) - 14 quotes
Al Oerter (Athlete, 1936—2007) - 4 quotes
Alexander O'Neal (Musician, 1953) - 3 quotes
Amos Oz (Writer, 1939) - 21 quotes
Andres Manuel Lopez Obrador (Politician, 1953) - 4 quotes
Andrew Oliver (Politician) - 4 quotes
Ann Oakley (Sociologist) - 6 quotes
Ann Oddy - 1 quotes
Annette O'Toole (Dancer, 1952) - 2 quotes
Aristotle Onassis (Businessman, 1906—1975) - 9 quotes
Arthur O'Shaughnessy (Poet, 1844—1881) - 1 quotes
Ashley Olsen (Actress, 1986) - 6 quotes
Austin O'Malley (Physicist) - 18 quotes
Babatunde Olatunji (Musician, 1927—2003) - 1 quotes
Barack Obama (President, 1961) - 64 quotes
Barbara Olson (Journalist, 1955—2001) - 15 quotes
Barney Oliver (Scientist, 1909—1995) - 10 quotes
Baroness Orczy (Novelist, 1865—1947) - 2 quotes
Ben Okri (Poet, 1959) - 17 quotes
Beth Orton (Musician, 1970) - 8 quotes
Bill O'Brien (Politician, 1929) - 1 quotes
Bill O'Reilly (Journalist, 1949) - 16 quotes
Bill Owen (1914—1999) - 2 quotes
Bill Owens (Politician, 1950) - 24 quotes
Billy Ocean (Musician, 1950) - 1 quotes
Bob Odenkirk (Actor, 1962) - 11 quotes
Bobby Orr (Athlete, 1948) - 15 quotes
Bruce Oldfield (Designer, 1950) - 2 quotes
Buck Owens (Musician, 1929—2006) - 21 quotes
Buzz Osborne (Musician) - 4 quotes
Carl Olson (Athlete, 1928—2002) - 5 quotes
Carl Orff (Composer, 1895—1982) - 2 quotes
Carl von Ossietzky (Activist, 1889—1938) - 1 quotes
Carre Otis (Model, 1968) - 11 quotes
Carroll O'Connor (Actor, 1922—2001) - 29 quotes
Charles Olson (Poet, 1910—1970) - 24 quotes
Charles Osgood (Journalist, 1933) - 6 quotes
Chris O'Donnell (Actor, 1970) - 1 quotes
Claes Oldenburg (Sculptor, 1929) - 1 quotes
Clifford Odets (Playwright, 1906—1963) - 4 quotes
Clive Owen (Actor, 1964) - 8 quotes
Conan O'Brien (Entertainer, 1963) - 27 quotes
Conor Cruise O'Brien (Politician, 1917—2008) - 5 quotes
Conor Oberst (Musician, 1980) - 15 quotes
Cynthia Ozick (Novelist, 1928) - 5 quotes
Dan O'Brien (Athlete, 1966) - 17 quotes
Daniel O'Connell (Politician, 1776—1847) - 2 quotes
Daniel Okrent (Editor, 1948) - 19 quotes

Daniel Ortega (Statesman, 1945) - 4 quotes
Dave Obey (Politician, 1938) - 4 quotes
David Obey (Politician, 1938) - 12 quotes
David Ogilvy (Businessman, 1911—1999) - 53 quotes
David Ortiz (Athlete, 1975) - 8 quotes
Denise Van Outen (Actress, 1975) - 1 quotes
Donald O'Connor (Musician, 1925—2003) - 9 quotes
Donny Osmond (Musician, 1957) - 6 quotes
Doug Ose (Politician, 1955) - 2 quotes
Ed O'Brien (Musician, 1968) - 24 quotes
Ed O'Neill (Actor, 1946) - 11 quotes
Edna O'Brien (Novelist, 1932) - 10 quotes
Edward James Olmos (Actor, 1947) - 30 quotes
Ellen Ochoa (Astronaut, 1958) - 2 quotes
Eugene O'Neill (Dramatist, 1888—1953) - 9 quotes
Eugene Ormandy (Musician, 1899—1985) - 21 quotes
Flann O'Brien (Writer, 1911—1966) - 3 quotes
Flannery O'Connor (Author, 1925—1964) - 24 quotes
Frank O'Connor (Author, 1903—1966) - 1 quotes
Frank O'Hara (Poet, 1926—1966) - 3 quotes
Frank Oz (Actor, 1944) - 6 quotes
Frederick Law Olmsted (Architect, 1822—1903) - 3 quotes
Frederick Scott Oliver - 3 quotes
Fulton Oursler - 3 quotes
Gary Oldman (Actor, 1958) - 28 quotes
Gene Oliver (Athlete, 1935) - 3 quotes
George Andrew Olah (Scientist, 1927) - 8 quotes
George Oppen (Poet, 1908—1984) - 8 quotes
George Orwell (Author, 1903—1950) - 104 quotes
Georgia O'Keefe (Artist, 1887—1986) - 13 quotes
Georgia O'Keeffe (Artist, 1887—1986) - 16 quotes
Hakeem Olajuwon (Athlete, 1963) - 10 quotes
Haley Joel Osment (Actor, 1988) - 4 quotes
Harry Oppenheimer (Businessman, 1908—2000) - 3 quotes
Heather O'Rourke (Actress, 1975—1988) - 9 quotes
Hermann Oberth (Scientist, 1894—1989) - 4 quotes
Hortense Odlum - 6 quotes
Ida Rentoul Outhwaite (Artist) - 4 quotes
J. Robert Oppenheimer (Physicist, 1904—1967) - 12 quotes
Jack Osbourne (Celebrity, 1985) - 16 quotes
Jacqueline Kennedy Onassis - 6 quotes
James Oliver (Politician) - 2 quotes
James Otis (Lawyer, 1725—1783) - 18 quotes
Jamie Oliver (Celebrity, 1975) - 5 quotes
Jean O'Leary (Activist, 1948—2005) - 7 quotes
Jennifer O'Neill (Actress, 1948) - 14 quotes
Jerry O'Connell (Actor, 1974) - 1 quotes
Jerry Only (Musician, 1959) - 25 quotes
Jerry Orbach (Actor, 1935—2004) - 10 quotes
Jesse Owens (Athlete, 1913—1980) - 13 quotes