• O'Brian, Hugh
• O'Brien, Conan
• O'Brien, Dave
• O'Brien, Edmond
• O'Brien, George
• O'Brien, Margaret
• O'Brien, Michael Patrick
• O'Brien, Pat
• O'Brien, Peter
• O'Brien, Richard
• O'Byrne, Brian F.
• O'Connell, Charlie
• O'Connell, Jack
• O'Connell, Jerry
• O'Connor, Carroll
• O'Connor, Donald
• O'Connor, Frances
• O'Connor, Gavin
• O'Connor, Kevin J.
• O'Connor, Sinead
• O'Dell, Nancy
• O'Donnell, Chris
• O'Donnell, Rosie
• O'Dowd, Chris
• O'Grady, Gail
• O'Hara, Catherine
• O'Hara, David
• O'Hara, Maureen
• O'Hara, Paige
• O'Hare, Denis
• O'Hurley, John
• O'Keefe, Jodi Lyn
• O'Keefe, Michael
• O'Leary, Matt
• O'Loughlin, Alex
• O'Malley, Mike
• O'Mara, Jason
• O'Nan, Stewart
• O'Neal, Ryan
• O'Neal, Tatum
• O'Neill, Ed
• O'Neill, Eugene
• O'Quinn, Terry
• O'Reilly, Bill
• O'Ross, Ed
• O'Rourke, P.J.
• O'Sullivan, Maureen
• O'Toole, Annette
• O'Toole, Peter
• O. Sanders, Jay
• O.A.R. (music group)
• Oakenfold, Paul
• Obama, Malia
• Obama, Michelle
• Obama, Sasha
• Oberon, Merle
• Obradors, Jacqueline
• Obst, Lynda
• Ocasek, Ric
• Odenkirk, Bob
• Of Montreal (music group)
• OFF! (music group)
• Offerman, Nick
• OFWGKTA (music group)
• Ogier, Bulle
• Oh, Sandra
• OK Go (music group)
• Oka, Masi
• Okonedo, Sophie
• Okuma, Enuka
• Ol' Dirty Bastard
• Olbermann, Keith
• Old Crow Medicine Show (music group)
• Oldfield, Mike
• Oldfield, Mike
• Oldman, Gary
• Olin, Lena
• Oliver, Jamie
• Oliver, John
• Olivier, Laurence
• Olmos, Edward James
• Olsen, Ashley
• Olsen, Eric Christian
• Olsen, Mary-Kate
• Olsen, Susan
• Olson, Candice
• Olson, Kaitlin
• Olson, Nancy
• Olyphant, Timothy
• Onassis, Jacqueline Kennedy
• One Direction (music group)
• Ono, Yoko
• Ontiveros, Lupe
• Oosterhouse, Carter
• Opening Ceremonies (music group)
• Opeth (music group)
• Orbach, Jerry
• Orbach, Ron
• Orbison, Roy
• Orchard Lounge (music group)
• Orianthi (singer)
• Orlando, Tony
• Orman, Suze
• Ormond, Julia
• Orquesta Buena Vista Social Club (music group)
• Orser, Leland
• Ortega, Kenny
• Orth, Zak
• Ortiz, Ana
• Ortiz, John
• Ortiz, Tito
• Osborne, Holmes
• Osborne, Jeffrey
• Osborne, Joan
• Osborne, Robert
• Osbourne, Jack
• Osbourne, Kelly
• Osbourne, Ozzy
• Osbourne, Sharon
• Oseland, James
• Osgood, Charles
• Osmanski, Joy
• Osment, Emily
• Osment, Haley Joel
• Osmond, Donny
• Osmond, Marie
• Osmonds (music group), The
• Ostrosky, Beth
• Oswalt, Patton
• Oteri, Cheri
• Other Lives (music group)
• Otto, James
• Otto, Miranda
• Otunga, David
• OutKast (music group)
• Overmyer, Amanda
• Owchar, Nick
• Owen, Clive
• Owen, Lloyd
• Owens, Buck
• Owens, Chris
• Owens, Gary
• Owens, Terrell
• Owl City (music group)
• Oxenberg, Catherine
• Oyelowo, David
• Oz, Frank
• Ozomatli (music group)