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- O, Brandy (Model)
- O.G., Ed
- O.J. Jose
- O´Brien, George
- O´Higgins, Bernardo
- O’Brien, Jack
- O’Brien, Reis
- O’Connell, Deirdre
- O’Connell, Veronica
- O’Dea, Joe
- O’Gleby, Sarah
- O’Neal, Frederick
- O’Neal, Shareef
- O’Neil, Nance
- O’Neil, William
- O’Neill, Nellie
- O’Neill, William
- O’Riley, Jim
- Oacpicagigua, Luis
- Oak, Common
- Oak, H.M.S. Royal (1892)
- Oak, Holm
- Oak, Professor
- Oak, Red
- Oak, White
- Oak Ridge Boys
- Oakar, Mary Rose
- Oakenfold, Paul
- Oakenshield, Thorin
- Oakerson, Jay
- Oakes, Randi
- Oakes, Richard
- Oakey, Philip
- Oakie, Jack
- Oakland, Simon
- Oakley, Annie
- Oakley, Berry
- Oakley, Roger
- Oaks, Brittany
- Oasis
- Oates, John
- Oates, Kenji
- Oates, Michelle
- Oates, Warren
- Oatley, Samuel
- Oatney, Steve
- Obama, Barack
- Obama, Michelle
- O'Banion, Dion
- O'Bannon, Presley
- O'Bannon, Rockne S.
- Obata, Toshishiro
- Obedzinski, Shane
- Obento
- Oberfrank, Matthias
- Oberk, Corporal
- Oberlander, James
- Oberman, Tracy-Ann
- Obernolte, Jay
- Oberon, Merle
- Obey Jay
- Obi, Chike
- Obi, Chris
- Obilic, Milos
- Obiora, Michael
- Oblivious Olivia
- Obregon, Ana
- O'Brian, Chloe
- O'Brian, Hugh
- O'Brian, Katy
- O'Brian, Kerry
- O'Brien, Ashley
- O'Brien, Austin
- O'Brien, Brendan
- O'Brien, Brooke
- O'Brien, Conan
- O'Brien, Dave
- O'Brien, Ed
- O'Brien, Edmund
- O'Brien, Erin
- O'Brien, Eugene
- O'Brien, George
- O'Brien, Gray
- O'Brien, Jack
- O'Brien, Keiko
- O'Brien, Kelly
- O'Brien, Kristen
- O'Brien, Margaret
- O'Brien, Maureen
- O'Brien, Miles
- O'Brien, Molly
- O'Brien, Nelly
- O'Brien, Pat
- O'Brien, Pat (b. 1948)
- O'Brien, Richard
- O'Brien, Robert
- O'Brien, Shauna
- O'Brien, Skip
- O'Brien, Stacey
- O'Brien, Steve
- O'Brien, Tammy
- O'Brien, Tom
- O'Brien, Virginia
- O'Brien, Willis
- O'Brien-Moore, Erin
- Obscene Gene
- Observation Decker
- Obsessed Jess
- Obsessed Olga
- Obsidian
- Obus
- O'Callaghan, Art
- O'Callaghan, John
- Ocampo, Jon
- Ocasek, Ric
- Ocasio-Cortez, Alexandria
- Occulus
- Ocean, Aletta (Adult Film)
- Ocean, Billy
- Ocean, HMS
- Ocean, Pacific
- Ocean Leatherjacket (fish)
- Ocean Master
- Ocean Sunfish (Fish)
- Oceanica
- Ocelot
- Ochi of Bestoon
- Ochiltree, Gary
- Ochoa, Ellen
- Ochoa, Jesus
- Ochs, Adolph
- O'Connell, Alex
- O'Connell, Brian K.
- O'Connell, Brian Kalin
- O'Connell, Brittany (Adult Film)
- O'Connell, Daniel
- O'Connell, Evy
- O'Connell, Hugh
- O'Connell, Jerry
- O'Connell, Taaffe
- O'Connell, Veronica
- O'Connell, William
- O'Conner, Richard
- O'Connor, Alex
- O'Connor, Billy
- O'Connor, Bob
- O'Connor, Brenock
- O'Connor, Caitlin
- O'Connor, Cardinal John
- O'Connor, Caroline
- O'Connor, Carroll
- O'Connor, Derrick
- O'Connor, Des
- O'Connor, Donald
- O'Connor, Hazel
- O'Connor, Kevin
- O'Connor, Mark
- O'Connor, Raymond
- O'Connor, Renee
- O'Connor, Richard
- O'Connor, Sandra Day
- O'Connor, Sinead
- O'Connor, Tim
- O'Connor, Una
- Octillery
- Octoguy (Nintendo)
- Octoomba (Nintendo)
- Octo-Paginini (The Tick)
- Octopunch (TF)
- Octopus
- Octopussy
- Octorok (Nintendo)
- Octuptarra Droid
- Oda, Kazumasa
- Odagawa, Ryan
- O'Dare, Maureen
- O'Day, Aubrey
- O'Day, Molly
- O'Day, Nell
- Odd Oz
- Oddie, Bill
- Oddish
- Oddit-Ty
- Oddjob
- Ode, Erik
- O'Dea, Denis
- O'Dea, Judith
- Odell, Benjamin
- Odell, Maude (Actress)
- O'Dell, Kelly (Adult Film)
- O'Dell, Sally
- Odemar, Fritz
- Odenkirk, Bob
- Odette, Mary
- Odie
- Odin
- Odinson, Thor
- Odle, Hermi
- Odo
- Odom Jr., Leslie
- O'Donnell, B. Walton
- O'Donnell, Cathy
- O'Donnell, Chris
- O'Donnell, Ernest
- O'Donnell, Roger
- O'Donnell, Rosie
- O'Donoghue, Michael
- O'Donohue, Becky
- O'Driscoll, Martha
- Oduye, Adepero
- O'Dwyer, William
- Odyssey, Cosmic
- Oedipus (The Tick)
- Oeming, Michael Avon
- Oersted, Hans Christian
- Oestvig, Aagard
- of Assisi, Francis
- of Brunswick, Ferdinand
- of Egmont, Lamoral
- of Fear, The Roofs
- of Germany, Louisa
- of Greece, Constantine II
- of Hearts, The King
- of Hearts, The Knave
- of Hearts, The Queen
- of Homburg, Frederick II
- Of Marble, Brock
- of Mecklenburg-Strelitz, Charlotte
- of Mecklenburg-Strelitz, Louise
- of Nations, League
- of Pappenheim, Gottfried Heinrich
- of Paradise, King Bird
- of Paradise, Red-Plumed Bird
- of Pisa, Leaning Tower
- of Prussia, Henry
- of Ren, The Knights
- of Saxe-Meiningen, Adelaide
- of Saxony, Albert
- of Woodstock, Edward
- of Wurttemberg, Eugen
- O'Fain, Dannie (Pirate)
- Ofarim, Abi
- Ofarim, Esther
- O'Farrell, Bernadette
- O'Ferrall, Trilby
- Off, Blast
- Offa, HEDDA
- Off-Color Carla
- Offee, Barriss
- Offenbach, Jacques
- Offensive Orlando
- Offensives, The Kharkov
- Offer, Tonya
- Offerman, Nick
- Office, Patent
- Officer, Imperial
- Offroad
- Offset
- O'Folliard, Tom
- Ogawa, Alyssa
- Ogawa, Makoto
- Ogg, Steven
- Ogilvie, Alec
- Ogilvy, Ian
- Ogle, Charles
- Ogle, Kevin
- Ogle, Melba
- Ogles, Pam
- Oglesby, Randy
- O'Gorman, Dean
- O'Grady, Eric
- O'Grady, Scott
- Ogun
- Ogura, Yuko
- Oh, Soon-Tek
- Oh Hairy! (Wacky Pkgs)
- Oh Shawna
- O'Halleran, Tom
- O'Halloran, Brian
- O'Halloran, Jack
- O'Hanlon, Ardal
- O'Hara, April
- O'Hara, Catherine
- O'Hara, Chief
- O'Hara, David
- O'Hara, Kelli
- O'Hara, Maureen
- O'Hara, Moira
- O'Hara, Shirley
- O'Hara, Toni
- O'Hare, Damian
- O'Hare, Denis
- O'Hare, Edward
- O'Hare, Edward J.
- O'Hare, Michael
- O'Hare, Sarah
- O'Hea, Brendan
- O'Heir, Jim
- O'Hennessy, Ross
- O'Herlihy, Dan
- O'Herlihy, Gavan
- Ohigashi, Liane
- Ohio
- Ohio Express
- Ohio Players
- Ohlendorf, Nathan
- Ohlsen, Heinz
- Ohnaka, Hondo
- O'Hurley, John
- Oingo Boingo
- Oishi, Mitsuki
- Oistrakh, David
- Ojeda, Eddie
- Ojeda-Rios, Filiberto
- OK Gordon
- Oka, Masi
- Okada, Yui
- Okamoto, Tao
- Okamura, Gerald
- Okamura, Mana
- O'Kane, Patrick
- Okano, Lyrica
- Okapi
- Okazaki, Miki
- O'Keefe, Dennis
- O'Keefe, Frank
- O'Keefe, Jodi Lyn
- O'Keefe, Johnny
- O'Keefe, Laurence
- O'Keefe, Michael
- O'Keefe, Pat
- O'Keefe, Walter
- O'Keeffe, Georgia
- O'Keeffe, Miles
- O'Kelley, Kaley
- Okenyl, Dayo
- Okereke, Kele
- Okiya, Subaru
- Oklahoma
- Okona, Thadiun
- Okonedo, Sophie
- Okonkwo, Idie
- Okoye
- Okrent, Daniel
- Okubo, Ayano
- Okuda, Amy
- Okuda, Michael
- Okuyama, Kazusa
- Ol' Faith Phil
- Oladejo, Oyin
- Olaf (Disney)
- Oland, Warner
- Olander, Jimmy
- Olandt, Ken
- Olav V
- Old Bear
- Old Bull, Moses
- Old English Sheepdog
- Old Faithful
- Old Grand-Mom (Wacky Pkgs)
- Old Ironsides (Train)
- Old Lace
- Old Man Logan
- Old Rod
- Old Spit (Wacky Pkgs)
- Old Time Hawkey
- Old Time Rock & Roland
- Olden, Hans
- Oldenburg, Claes
- Oldfield, Mike
- Oldfield, Rebecca
- Oldfield, Richard
- Oldfield, Sally
- Oldford, Britne
- Oldham
- Oldham, Gerry (Model)
- Oldham, Kathleen
- Oldin, Gunnar
- Oldland, Lillian
- Oldman, Gary
- Olds, Betty
- Olds, Gabriel
- Olds, Robin
- Ole Faithful
- Ole Ole (Band)
- O'Leary, Jay
- O'Leary, Leonore
- O'Leary, Michael
- O'Leary, William
- olerud363
- Oleson, Jeff
- Olga, Grand Duchess
- Olga, Yoga
- Oliè, Ric
- Olieslagers, Jan
- Olin, Ken
- Olin, Lena
- Olin, Mats
- Olin, Stig
- O'Lisa, Piece
- O'List, David
- Olive, Patrick
- Oliveira, Raica
- Oliver (Disney)
- Oliver, Alexis
- Oliver, Alison
- Oliver, Edna May
- Oliver, Gordon
- Oliver, Ingrid
- Oliver, Jamie
- Oliver, Janis
- Oliver, Jenny
- Oliver, King
- Oliver, Kristine
- Oliver, Nicole
- Oliver, Oily
- Oliver, Seena
- Oliver, Susan
- Oliver, Tommy (MMPR)
- Oliver, Travis
- Oliver, Vic
- Oliver Easy
- Olivetti, Ariel
- Olivi, Fred
- Olivia, Lorraine
- Olivier, Laurence
- Olivieri, Dawn
- Olivio, Corine
- Olivo, Karen
- Olkewicz, Walter
- Ollerton, Gifford
- Ollie, Obstructin'
- Olliffe, Pat
- Ollivander, Garrick (HP)
- Olly
- Olly, Marietta
- Olmert, Ehud
- Olmos, Bodie
- Olmos, Edward James
- Olmstead, Charles H.
- Olmstead, Gertrude
- Olmsted, Frederick Law
- Olney, Buster
- Olofsson, Ann-Sofie
- O'Loughlin, Gerald S.
- Olow, Bengt
- Olsen, Allegra
- Olsen, April (Adult)
- Olsen, Ashley
- Olsen, Bree
- Olsen, Elizabeth
- Olsen, Ingrid
- Olsen, James
- Olsen, Jimmy
- Olsen, Johanna
- Olsen, Mary-Kate
- Olsen, Ryan
- Olsen, Sarah
- Olsen, Susan
- Olson, Bree
- Olson, Clifford
- Olson, Gale
- Olson, Hope
- Olson, Justin
- Olson, Kalin
- Olson, Nancy
- Olson, Olivia
- Olson, Pete
- Olson, Shanna
- Olsson, Nigel
- Olsson, Sandy (Grease)
- Olsson, Ty
- Olszewska, Maria
- Olt, Heather
- Olusanmokun, Babs
- Olvera, Jane
- Olympic National Park
- Olyphant, Timothy
- Olyver
- Omahyra
- O'Malley, Cathi
- O'Malley, J. Pat
- O'Malley, Katie
- O'Malley, Keith
- O'Malley, Martin
- O'Malley, Pat
- O'Malley, Robert (USMC)
- O'Malley, Rory
- O'Malley, Thomas (Disney)
- O'Malley Dillon, Jennifer
- Omambala, Chu
- Omanyte
- Omar, Ilhan
- Omar Ogre
- Omar Omen
- O'Mara, Kate
- Omarosa
- Omasa, Aya
- Omastar
- Ome, Jaslyn
- O'Meara, Martin
- O'Mearáin, Lochlann
- O'Meara-Sanders, Jane
- Omega (Dr. Who)
- Omega (Star Wars)
- Omega, Kid
- Omega Red
- Omega Supreme (TF)
- Omene
- Omera
- Omlie, Phoebe
- Ommis, Kesin (Star Wars)
- Ommlen, Praster
- Ommundsen, Corporal Harcourt
- Omohundro, Texas Jack
- Omori, Ayuko
- Omundson, Timothy
- On Camera Cameron
- Onager (Animal)
- Onaodowan, Okieriete
- Onassis, Aristotle
- Onate, Juan de
- Onatopp, Xenia
- Ondra, Anny
- One, Number
- One Bull
- One Direction
- One Ivan
- One of Juan
- One Way (Band)
- O'Neal, Alexander
- O'Neal, Carol
- O'Neal, Charles Duncan
- O'Neal, Ryan
- O'Neal, Shaquille
- O'Neal, Stanley
- O'Neal, Tatum
- O'Neal, Zelma
- Onegin, Sigrid
- O'Neil, April
- O'Neil, Barbara
- O'Neil, Denny
- O'neil, Frank R.
- O'Neil, Linda
- O'Neil, Peggy
- O'Neil, Robert J.
- O'Neil, Sally
- O'Neil, Sherry
- O'Neil, Sophie
- O'Neil, Tricia
- O'Neill, Abigail
- O'Neill, Ed
- O'Neill, Eugene
- O'Neill, Jack
- O'Neill, Jamie
- O'Neill, Jennifer
- O'Neill, Kevin
- O'Neill, Peggy
- O'Neill, Robert
- O'Neill, Tip
- O'Neill, Willa
- O'Neill, William
- One-Night Stan
- One-Note, Johnny
- OneRepublic
- Ong, Andrea
- Ong, Jackson
- Onith, M'iiyoom
- Onix
- Onizuka, Ellison
- Ono, Nonoka
- Ono, Yoko
- Onoe, Ukon
- Onorati, Peter
- Onslaught (Marvel)
- Onslaught (TF)
- Ontario
- Ontiveros, Lupe
- Ontkean, Michael
- Onweagba, Oluchi
- Onyo, Ketsu
- Onyx, Narda
- Oola
- Oolong (DragonBall)
- OOM-9
- Oops, Allie
- Oozing Ozzy
- Opah (Fish)
- Opaka, Kai
- Oparei, DeObia
- Opatoshu, David
- Opel, Nancy
- Open Scully
- Opener, Candice
- Operation Battleaxe
- Operation Pluto
- Operation Zipper
- Ophelia Ornament
- Ophelia Orphan
- Ophelia
- Ophir, H.M.S.
- Oporto (City)
- Opossum
- Opp, Julie (Actress)
- Oppenheimer, Alan
- Oppenheimer, Clark
- Oppenheimer, Robert
- Opress, Savage
- Opsal, Anna
- Opstedahl, Loren
- Opti Cal
- OpticNerve
- Optimus, Optimal (TF)
- Optimus Fine
- O'Quinn, Terry
- Ora, Rita (Actor/Sing)
- Oram, Jamie
- Oram, Jodie
- Oram, Mona
- Orange, Agent
- Orange, David
- Orange, Walter
- Orange Free State
- Orange Gina
- Orange Tip (Butterfly)
- Oranguru
- Orangutan
- Orbach, Jerry
- Orbak
- Orban, Tina Jo
- Orbison, Roy
- Orca
- Orchard Oriole (Bird)
- Orchestral Manoeuvres in the Dark
- Orchid, Rock
- Orchis, Bee
- Orchis, Fragrant
- Orci, Roberto
- Orde, Beryl
- Ordesky, Mark
- Ordnance Quick-Firing 6-pounder 7 cwt
- Ordo, Canderous
- Ore, Rebecca
- Oregon
- O'Reilly, Calvin
- O'Reilly, Genevieve
- O'Reilly, Paula
- O'Reilly, Robert (Actor)
- Orell
- Oremus, Stephen
- Oreskovich, Alesha
- Orfeh
- Organ, Eugene
- Organa, Bail
- Organa, Breha
- Organa, Cousin Niano
- Organa, Duchess Celly
- Organa, Duke Kayo
- Oribi
- Origami Tommy
- Original Art
- O'Riley, Chris
- O'Riley, James
- O'Riley, Jim
- Oriole, Altamira
- Oriole, Bullock's
- Oriole, Spot-breasted
- Oriole, Yellow
- Orion (DC)
- O'Riordan, Delores
- Orka
- Orland, Michael (Music)
- Orlando, Joe
- Orlando, Tony
- Orlando, Treza
- Orlando, Vittorio
- Orleans
- Orloff, Peter
- Orme, Denise
- Ormeaux, Dollard Des
- Ormond, Julia
- Ormsbee, Ebenezer J.
- Ormston, Dean
- Ornato, Anthony
- Ornelas, Arban
- Ornitholestes
- Ornithomimus
- Ornithosuchus
- Ornstein, Michael
- Oropendola, Montezuma (Bird)
- Orosco, Ryan
- O'Ross, Ed
- O'Rourke, Beto
- O'Rourke, Charisse
- O'Rourke, Grant
- O'Rourke, Heather
- O'Rourke, Kasey
- Orphan Maker
- Orquesta Mondragon (Band)
- Orr, Benjamin
- Orr, James Lawrence
- Orr, Justin Jusscope
- Orrall, Robert Ellis
- Orray
- Orrelios, Zeb
- Orrgo
- Orrimaarko (Star Wars)
- Orser, Leland
- Ortaleza, Robert
- Ortega, Daniel
- Ortega, Jimmy
- Ortega, Lisa
- Ortega, Palito
- Ortegas, Erica
- Ortho Donny
- Orth-Pallavicini, Nicole
- Ortiz, Alejandro
- Ortiz, John
- Ortiz, Juan
- Ortiz, Liza
- Ortiz, Phil
- Ortiz, Raz
- Ortiz, Shalim
- Ortiz, Tiana
- Ortner, Yvonne (Model)
- Orwell, Candice
- Orwell, George
- O'Ryan, Caitlin
- O'Ryan, John
- Oryx, Arabian
- Orzabal, Roland
- Osborn, Byron T.
- Osborn, Harry
- Osborn, Norman
- Osborne, Baby Marie
- Osborne, Bertin
- Osborne, Bobby
- Osborne, Brothers
- Osborne, Drew
- Osborne, Jeffrey
- Osborne, John
- Osborne, Septimus
- Osborne, Sonny
- Osborne, T.J.
- Osborne, Vivienne
- Osborne, Will
- Osbourne, Jack
- Osbourne, Kelly
- Osbourne, Ozzy
- Osbourne, Sharon
- Oscar, Brad
- Oscar, Offensive
- Oscar, Oozy
- Oscar II
- Oscar La Vista
- Oscar Moron (Wacky Pkgs)
- Oscar The Grouch
- Oscarsson, Per
- Osceola (Indian)
- Osha
- O'Shaughnessy, Terrence J.
- O'Shea, Michael
- O'Shea, Oscar
- O'Shea, Tessie
- Oshima, Hiromi
- Oshima, Mai
- Oshun
- Osinski, Maximilian
- Oslin, K. T.
- Osmeña, Sergio
- Osment, Emily
- Osment, Haley Joel
- Osmond, Alan
- Osmond, Cliff
- Osmond, David
- Osmond, Donny
- Osmond, Douglas
- Osmond, Jay
- Osmond, Jimmy
- Osmond, Ken
- Osmond, Marie
- Osmond, Merrill
- Osmond, Michael
- Osmond, Nathan
- Osmond, Wayne
- Osnes, Laura
- Osprey
- Ossbahr, Cécile
- Ossoff, Jon
- Osteen, Joel
- Ostegard, Adam
- Osten, Olaf
- Ostend (City)
- Osterhaus, Hugo
- Osterholm, Michael
- Osterwald, Hazy
- Ostiz, Maria
- Ostrander, Elizabeth
- Ostrer, Pamela
- Ostrich
- Ostriche, Muriel
- Ostrum, Peter
- Ostyn, Berthe
- O'Sullivan, Gilbert
- O'Sullivan, Jacquie
- O'Sullivan, Lawrence
- O'Sullivan, Maureen
- O'Sullivan, Richard
- O'Sullivan, Timothy
- Oswald, Clara
- Oswald, Lee Harvey
- Oswald the Lucky Rabbit
- Oswalda, Ossi
- Oswalt, Patton
- Otani, Masae
- Oteri, Cheri
- Otero, Julia
- Otero, Mdlle. La Belle
- Othell
- Othello
- Otis
- Otis, Elisha
- Otis, Elwell
- Otis, Shuggie
- Otis Jr., James
- Otoha (Idol)
- Otone, Nana
- O'Toole, Annette
- O'Toole, Debbie
- O'Toole, Mark
- O'Toole, Nathan
- O'Toole, Peter
- O'Toole, Plenty
- Ottawa (City)
- Ottendorfer, Oswald
- Otter
- Otter, Butch
- Otterhound
- Ottinger, John
- Otto
- Otto, Barry
- Otto, Götz
- Otto, Miranda
- Otto, Paul
- Otto, Richard
- Otto Graph
- Otto of Bavaria
- Otto Pus
- Ottoman Empire
- Ottoni, Wanda
- Ouellet, Maryse
- Ouellet, USS (FF-1077)
- Ouija Walt
- Oujiri, John
- Oum, Siya
- Our Daughter's Wedding (Band)
- Our Gang
- Ourin
- Ouspenskaya, Maria
- Out, Brock
- Out, Warren
- Outback (G.I. Joe)
- Outback (TF)
- Outer Space Chase
- Outerbridge, Peter
- Outerspace Chase
- Outkast
- Outlaw
- Outram, Sir James
- Out-to-Lunch Lance
- Ouzounova, Rady
- Ovale, Vasso
- Ovechkin
- Ovel, Gerald
- Ovenbird
- Over Al
- Over Eatin' Ethan
- Over Etan
- Over Etta
- Over Killian
- Overflow Joe
- Overflowin' Owen
- Overgard, William
- Overlord, Robert
- Overman, Lynne
- Overmyer, Robert F.
- Overpopulate Ted
- Over-Ripe Melanie
- Over-Seasoned Sean
- Overstreet, Paul
- Overstreet, Tommy
- Overton, Frank
- Overton, Kelly
- Overton, Molly (Model)
- Overton, Nancy
- Ovid
- Ovion
- Oviraptor
- Ovissian
- Ovitz, Judy
- Ovoids
- Owen, Catherine Dale
- Owen, Dreek
- Owen, Gary
- Owen, Jake
- Owen, Jim
- Owen, Michael
- Owen, Randy
- Owen, Reginald
- Owen, Rena
- Owen, Robert
- Owen, Robert (b. 1771)
- Owen, Seena
- Owen, Sion Tudor
- Owen, U.F.
- Owen, Virginia
- Owen Bubbles
- Owen-Pierre, Lindsay
- Owens, Bonnie
- Owens, Buck
- Owens, Buddy Alan
- Owens, Burgess
- Owens, Chris
- Owens, Christy (Model)
- Owens, Gary
- Owens, Geoffrey
- Owens, Jack
- Owens, Marni
- Owens, Mary Ann
- Owens, Perry
- Owens, Rhiannon
- Owens, Robert
- Owens, Sam
- Owens, Shirley
- Owens, Susie
- Owl (Marvel)
- Owl, Barn
- Owl, Barred
- Owl, Burrowing
- Owl, Hawk
- Owl, Northern Saw-whet
- Owl, Screech
- Owl, Seychelles
- Owl, Short-Eared
- Owl, Tawny
- Owl (Disney)
- Owlman (DC)
- OWO-1
- Owosekun, Joann
- Owsley, Monroe
- Ox (Animal)
- Ox, Musk
- Ox, The (Marvel)
- Oxa, Anna
- Oxford, Airspeed
- Oxford, Morris
- Oxford University
- Oxfordshire Yeomanry
- Oxley, Harold
- Oxmyx, Bella
- OXO
- Oyarzun, Alonso
- Oyaya, Mary
- Oyl, Castor
- Oyl, Olive
- Oystercatcher (bird)
- Oz
- Oz, Daphne
- Oz, Frank
- Oz, Mehmet
- Oz, Mike
- Oz the Wizard
- Oz Waddle
- Ozanian, Andranik Toros
- Ozawa, Maria
- Ozeray, Madeleine
- Ozomatli (Band)
- Ozone (G.I. Joe)
- Ozone Holly
- Ozymandias
- Ozymandius (Marvel)
- Ozzel, Admiral
- Oz-Zone Depletion