• Lawrence O'Donnell
  • July 18, 2005
  • March 16, 2004
• Catherine O'Hara
  • December 1, 2006
• Ed O'Neill
  • February 1, 2010
• P.J. O'Rourke
  • February 5, 2007
• James Oakes
  • April 6, 2007
• Joyce Carol Oates
  • June 28, 2005
• Sen. Barack Obama
  • February 18, 2008
  • October 18, 2007
  • October 23, 2006
  • September 27, 2005
  • November 3, 2004
  • July 29, 2004
  • March 29, 2004
• President Barack Obama
  • January 20, 2009
• Odetta
  • December 3, 2008
  • January 25, 2008
• Charles Ogletree
  • June 6, 2006
  • June 17, 2004
• Masi Oka
  • April 27, 2007
• Sophie Okonedo
  • February 9, 2005
• Edward James Olmos
  • April 2, 2004
• Dr. Olufunmilayo Olopade
  • July 10, 2009
• Omarion
  • April 8, 2005
• Michael Ondaatje
  • June 22, 2007
• Michael Oren
  • February 14, 2007
• Ambassador Michael Oren
  • October 19, 2009
• Paul Orfalea
  • October 6, 2005
• Suze Orman
  • February 9, 2009
  • March 5, 2007
  • March 4, 2005
  • March 1, 2004
• Roscoe Orman
  • October 4, 2006
• Beth Orton
  • March 22, 2006
• Royce Osborn
  • August 18, 2006
  • August 17, 2006
  • March 7, 2006
  • September 9, 2005
• Dawn Ostroff
  • September 19, 2006
• Michael Otterman
  • October 16, 2007
• Spencer Overton
  • August 10, 2006
• Gov. Bill Owens
  • October 28, 2004
• Catherine Owens
  • January 22, 2008
• Frank Oz
  • June 19, 2007
• Omarion and Marques Houston
  • October 31, 2007
• Otis Williams, Claudette Robinson
  • April 1, 2009