- O'Brien, Bill
- O'Brien, Conan
- O'Brien, Conor
- O'Brien, Dan
- O'Brien, Ed
- O'Brien, Edna
- O'Brien, Flann
- O'Brien, Kate
- O'Brien, Margaret
- O'Brien, Richard
- O'Brien, Soledad
- O'Casey, Sean
- O'Connell, Daniel
- O'Connell, Jerry
- O'Connell, William
- O'Connor, Carroll
- O'Connor, Donald
- O'Connor, Flannery
- O'Connor, Frank
- O'Connor, John
- O'Connor, Renee
- O'Connor, Sandra
- O'Connor, Sinead
- O'Dell, Nancy
- O'Donnell, Chris
- O'Donnell, Christine
- O'Donnell, Rosie
- O'Donoghue, Michael
- O'Faolain, Sean
- O'Grady, Paul
- O'Hair, Madalyn
- O'Hara, Catherine
- O'Hara, Frank
- O'Hara, John
- O'Hara, Maureen
- O'Keefe, Jodi
- O'Keeffe, Georgia
- O'Leary, Jean
- O'Loughlin, Alex
- O'Malley, Austin
- O'Neal, Alexander
- O'Neal, Shaquille
- O'Neal, Tatum
- O'Neil, Nance
- O'Neill, Ed
- O'Neill, Eugene
- O'Neill, Jennifer
- O'Neill, John
- O'Neill, Paul
- O'Neill, Thomas
- O'Reilly, Bill
- O'Reilly, Tim
- O'Rourke, Heather
- O'Rourke, P.
- O'Shaughnessy, Arthur
- O'Toole, Annette
- O'Toole, John
- O'Toole, Peter
- O072024, Marc
- Oakenfold, Paul
- Oakes, Riley
- Oakley, Ann
- Oakley, Rachel
- Oaks, Sophia
- Oakwood, Jenna
- Oan, Mia
- Oates, John
- Oates, Johnny
- Oates, Joyce
- Oatman, Jamie
- Obama, Barack
- Obama, Barrack
- Obama, Michelle
- Obama, Sasha
- Obasanjo, Olusegun
- Oberlin, Karen
- Oberlly, Janis
- Oberoi, Andreas
- Oberon, Merle
- Oberson, Michelle
- Oberst, Conor
- Oberth, Hermann
- Obey, Dave
- Obey, David
- Obrador, Andres
- Obrien, Gabriella
- Obrien, Rachel
- Ocasek, Ric
- Occam, William
- Ocean, Billy
- Ocean, Frank
- Ocean, Maxine
- Ocean, Serenity
- Oceans, Harmony
- Ochenkrums, Giovanna
- Ochoa, Clara
- Ochoa, Daniela
- Ochoa, Ellen
- Ochoa, Stephanie
- Ochs, Phil
- Oddity, Luna
- Odds, Amelia
- Oddy, Ann
- Odell, Clara
- Odell, Jamie
- Odenkirk, Bob
- Odets, Clifford
- Odland, Steve
- Odlum, Hortense
- Odom, William
- Odunebi, Stephen
- Oe, Kenzaburo
- Oech, Roger
- Oergene, Magda
- Oerter, Al
- Offer, Eleanor
- Oftedal, Laura
- Often, Polly
- Ogilvy, David
- Ogre, Camilla
- Oh, Sadaharu
- Oh, Sandra
- Ohmae, Kenichi
- Ohno, Apolo
- Okrent, Daniel
- Okri, Ben
- Olah, George
- Olajuwon, Hakeem
- Olando, Jamie
- Olasky, Marvin
- Olatunji, Babatunde
- Olbermann, Keith
- Oldenburg, Claes
- Oldfield, Alison
- Oldfield, Bruce
- Oldfield, Mike
- Oldham, John
- Oldham, Will
- Oldman, Gary
- Olds, Sharon
- Oleynik, Larisa
- Olin, Emma
- Oliphant, Margaret
- Oliphant, Mark
- Oliphant, Pat
- Oliss, Clara
- Oliva, Tony
- Olive, Jamie
- Olivea, Jamie
- Oliveira, Elizabeth
- Oliveira, Glen
- Oliveira, Isabella
- Oliveira, Sam
- Oliveira, Sofia
- Oliveira, Sophia
- Oliveira, Victoria
- Oliver, Amanda
- Oliver, Andrew
- Oliver, Arthur
- Oliver, Barney
- Oliver, Chris
- Oliver, Frederick
- Oliver, Gene
- Oliver, James
- Oliver, Jamie
- Oliver, Jonathan
- Oliver, June
- Oliver, Lauren
- Oliver, Mary
- Oliver, Maya
- Oliver, Morgan
- Oliver, Peter
- Oliver, Rachel
- Oliver, Scarlett
- Oliver, Sofia
- Oliver, Sophia
- Oliver, Susan
- Olivers, Jamie
- Olivia, Amelia
- Olivier, Laurence
- Olmos, Edward
- Olmsted, Frederick
- Ologo, Julia
- Olsen, Ashley
- Olsen, Jasmine
- Olsen, Ken
- Olsen, Mary-Kate
- Olsen, Merlin
- Olsen, Mia
- Olsen, Phil
- Olsen, Samantha
- Olsen, Sophia
- Olsen, Susan
- Olsen, Tillie
- Olson, Barbara
- Olson, Carl
- Olson, Cassandra
- Olson, Charles
- Olson, Johnny
- Olson, Karen
- Olson, Lisa
- Olson, Samantha
- Olson, Sophia
- Olson, Ted
- Olsson, James
- Olsson, Jamie
- Olsson, Sophia
- Olver, John
- Olver, Sam
- Olvera, Jorge
- Olyphant, Timothy
- Omar, Mohammed
- Onassis, Aristotle
- Onassis, Jacqueline
- Ondaatje, Michael
- Ong, Crystal
- Ong, Melody
- Only, Jerry
- Ono, Yoko
- Onoprison, Chobi
- Ontherise, Jamie
- Ontiveros, Linda
- Oogway, Master
- Oong, Helen
- Ope, Eleanor
- Operatis, Claire
- Opie, John
- Oppen, George
- Oppenheim, Joanne
- Oppenheim, Tom
- Oppenheimer, Harry
- Oppenheimer, J.
- Oracle, Kathy
- Orangetree, Sophia
- Orbach, Jerry
- Orbach, Susie
- Orben, Robert
- Orbison, Roy
- Orchid, Taggedscribble
- Orczy, Baroness
- Orff, Carl
- Origen
- Orlandi, Clara
- Orlando, Jenna
- Orlando, Tony
- Orlean, Susan
- Orleans, Claire
- Orman, Suze
- Ormandy, Eugene
- Ormond, Julia
- Ornstein, Leo
- Orozco, Jose
- Orr, Benjamin
- Orr, Bobby
- Orr, John
- Orr, Leonard
- Orr, Mia
- Orrico, Stacie
- Orsini, Alessia
- Orszag, Peter
- Ortega, Clara
- Ortega, Daniel
- Ortega, Jenna
- Ortega, John
- Ortega, Julia
- Ortega, Lily
- Ortega, Maria
- Ortega, Sandra
- Ortega, Sofia
- Ortega, Sophia
- Ortiz, Alexandria
- Ortiz, Amber
- Ortiz, Claire
- Ortiz, Clara
- Ortiz, David
- Ortiz, Gabrielle
- Ortiz, Isabella
- Ortiz, Jasmine
- Ortiz, Jenna
- Ortiz, Johanna
- Ortiz, Jonathan
- Ortiz, Lea
- Ortiz, Lisa
- Ortiz, Maria
- Ortiz, Maya
- Ortiz, Ruby
- Ortiz, Samantha
- Ortiz, Selena
- Ortiz, Sofia
- Ortiz, Solomon
- Ortiz, Sophia
- Ortiz, Stephanie
- Ortiz, Valentina
- Ortiz, Vivian
- Orton, Beth
- Orton, Joe
- Orts, Clara
- Orwell, George
- Orwell, Jamie
- Osaka, Naomi
- Osakul, Clara
- Osborn, Alex
- Osborn, Sam
- Osborne, Adam
- Osborne, Buzz
- Osborne, Charlie
- Osborne, Clara
- Osborne, John
- Osborne, Luna
- Osborne, Tom
- Osbourne, Jack
- Osbourne, Kelly
- Osbourne, Lila
- Osbourne, Ozzy
- Osbourne, Sharon
- Oscar, Oliver
- Ose, Doug
- Osgood, Charles
- Osgood, Clara
- Osler, William
- Osment, Haley
- Osmond, Donny
- Osmond, Marie
- Ossietzky, Carl
- Osteen, Joel
- Osteen, Jonathan
- Ostroff, Sarah
- Ostwald, Wilhelm
- Oswald, Clara
- Oswald, Lee
- Oswald, Marguerite
- Oswald, Marina
- Oswalt, Patton
- Otis, Carre
- Otis, James
- Ott, Jamie
- Ott, Jennifer
- Ott, Mel
- Otter, Butch
- Otto, Jim
- Otto, John
- Otto, Miranda
- Otto, Rudolf
- Otway, John
- Otway, Thomas
- Ouaida, Sam
- Ouida
- Oursler, Fulton
- Outen, Denise
- Outhwaite, Ida
- Ouwerkerk, Ellie
- Ovechkin, Alex
- Overbury, Thomas
- Ovid
- Owen, Alex
- Owen, Bill
- Owen, Clive
- Owen, Jake
- Owen, Jamie
- Owen, John
- Owen, Michael
- Owen, Richard
- Owen, Robert
- Owen, Sofia
- Owen, Wilfred
- Owens, Alexandra
- Owens, Allison
- Owens, Anna
- Owens, Bill
- Owens, Brittany
- Owens, Buck
- Owens, Cassandra
- Owens, Clara
- Owens, Dana
- Owens, Diana
- Owens, Gabrielle
- Owens, Grace
- Owens, Harper
- Owens, Jacqueline
- Owens, Jamie
- Owens, Jasmine
- Owens, Jenna
- Owens, Jesse
- Owens, Katrina
- Owens, Madison
- Owens, Major
- Owens, Maya
- Owens, Mia
- Owens, Michelle
- Owens, Olivia
- Owens, Samantha
- Owens, Sara
- Owens, Sarah
- Owens, Sasha
- Owens, Sophia
- Owens, Stephanie
- Owens, Terrell
- Owoh, Nkem
- Oxenham, John
- Oxford, Alex
- Oxley, Michael
- Oz, Amos
- Oz, Frank
- Ozick, Cynthia
- Ozihel, Naomi