List of DC Comics characters: O

O

 * O'Brian, Patrick "Eel" (also known as Plastic Man)
 * O'Brien, Kyle (also known as Green Guardsman) (Amalgam Comics)
 * O'Brien, Seamus (also known as Deathtrap) (WildStorm)
 * O'Casey, Lance (Fawcett Comics)
 * O'Connell, Travis
 * O'Dare, Charity (see Charity)
 * O'Donnel, Winston Churchill
 * O'Donnell, Jack
 * O'Grady, Sean (also known as Hot-Head)
 * O'Hara, Miles, Chief (also known as Clancy O'Hara)
 * O'Leary, Dutch
 * O'Malley, P.J. (also known as Longarm) (Hasbro)
 * O'Reilly, Molly (Vertigo)
 * O'Riley, Red (also known as Rory O'Riley (or O'Reilly) (Fawcett Comics)
 * O'Rourke
 * O'Rourke
 * O'Rourke, Li-san (Atari, Inc)
 * O'Rourke-Singh, Erin Bia (also known as Dart) (Atari, Inc)
 * O'Ryan, Devlin (also known as Reflex)
 * O'Valeron, Vernon (also known as Vartox)
 * Oa the Living Planet (Amalgam Comics)
 * Oakley, Annie
 * Obama, Barack (Warner Bros. Animation)
 * Obatala (also known as Efraim Ngai)
 * Obeah Man
 * Oberon
 * Oblivion
 * Obrey, Lord
 * Obsession (also known as Superwoman and Dana Dearden)
 * Obsidian
 * Ocean Master (also known as Orm Curry)
 * Oceanus
 * Ochun
 * Occult, Richard (also known as Doctor Occult)
 * Octavian (also known as Augustus)
 * Odd Man (also known as Clay Stoner)
 * Odds Renaldi
 * Odets, Jeremiah
 * Odin
 * Oeone
 * Officer Anderson
 * Officer Bayas
 * Officer Bellows (Fawcett Comics)
 * Officer Clancy
 * Officer Harkins
 * Officer Kunkel
 * Officer Merkel (also known as Stan Merkel)
 * Officer Merlo
 * Officer Morgan (Vertigo)
 * Officer Murphy
 * Officer Rowe
 * Officer Russell
 * Officer Sinkovec
 * Officer Swirski (Vertigo)
 * Officer Tiefenbacher
 * Officer Varsos
 * Officer Wilkes (Warner Bros. Animation (DCAU))
 * Officer Xue
 * Off-Ramp (also known as George Sloan)
 * Offspring
 * Ogden, J.R.
 * Ognats, Jenni (also known as XS)
 * Ognats, Jeven
 * Ogre
 * Ogun
 * Ohiyesa Smith (also known as Pow Wow Smith)
 * Ohm
 * Ohmen (also known as Union) (WildStorm)
 * Oho-Besh
 * Okeontis
 * Okonoko
 * Oksana Verchenko (also known as White Queen (I))
 * Olaf Bjornson (Quality Comics)
 * Olaffson, Ewald
 * Olafsdotter, Tora (also known as Ice)
 * Olapet
 * Old MacDonald (20th Century-Fox Television)
 * Old Snake
 * Old-Timer (also known as Appa Ali Apsa)
 * Olga, Queen of the Cossacks (20th Century-Fox Television)
 * Olia (Fawcett Comics)
 * Oliver Queen (also known as Green Arrow)
 * Oliversity
 * Olivia Beezer
 * Olivia Queen (also known as Black Canary (DC Elseworlds)
 * Olivia Reynolds
 * Olivia Tallow
 * Ollie
 * Ollie (Warner Bros. Animation (DCAU))
 * Ollie's boss
 * Olorun
 * Olsen, Jenny
 * Olsen, Jimmy (The Adventures of Superman (radio))
 * Olsen, Sarah
 * Ol-Vir of Daxam
 * Olympia Atreides (WildStorm)
 * Olympia
 * Olympian
 * Omac
 * Omar Zingh (Fawcett Comics)
 * Omega
 * Omen (see Lilith)
 * Omerta the Silencer (also known as Donald Campbell)
 * Omni (also known as Cameron Begay)
 * Omnibeast
 * Omoto, Laira
 * Ona Tomsen
 * One-Punch Kid (also known as Annihilator and Karl Keller)
 * Onimar Synn
 * Onomatopoeia
 * Ontiir
 * Onyx (I)
 * Onyx (II)
 * Ool
 * Oom the Mighty
 * Ophidian
 * Opral, Gnill (also known as Kid Psycho)
 * Opto309v
 * Ora
 * Oracle (also known as Barbara Gordon)
 * Oracle of Delphi
 * Orana
 * Orange
 * Orca
 * Ord Quelu (also known as Duplicate Boy and Quelu Ord)
 * Orestes
 * Organ Grinder (Warner Bros.)
 * Organus
 * Orion
 * Orion Orton
 * Orion, Adam (also known as Hunter)
 * Orion, Lucas (Atari, Inc)
 * Orithia
 * Orlan
 * Orloff, Serge
 * Ornitho
 * Orn-Zu
 * Oro (Milestone Media)
 * Ororo Munroe (also known as Wonder Woman and Princess Ororo of Themyscira) (Amalgam Comics)
 * Orpheus (also known as Gavin King)
 * Orpheus
 * Orr, Elias (also known as Mister Orr)
 * Ortiz (Warner Bros. Animation (DCAU))
 * Orunmilla
 * Osain
 * Osborn, Harvey (Norman) (also known as Two-Faced Green Goblin and Green Goblin) (Amalgam Comics)
 * Oscar Asherman
 * Oscar the Gumshoe
 * O-Sensei
 * Osgood Pellinger
 * Oshunmare
 * Osira
 * Osiris
 * Osiris (20th Century-Fox Television)
 * Osiris, Doctor (WildStorm)
 * Osmium
 * Osprey
 * Oswald C. Cobblepot (also known as Penguin)
 * Oswald Loomis (see Prankster)
 * Oswald Wimple
 * Otis (also known as Orville Gump)
 * Otto Drexel
 * Otto Octavius (Amalgam Comics)
 * Outburst (also known as Mitch Anderson)
 * Outlaw
 * Outlaw Benton
 * Outpost
 * Output (also known as Cullen Thane)
 * Output
 * Outsider (also known as Alfred Pennyworth)

Outsiders

 * Overload (Warner Bros. Animation)
 * Overlord (also known as Sandor Fane)
 * Overlord (also known as Underling)
 * Overlord Prime
 * Overmaster
 * Override
 * Overseer
 * Overseer
 * Overthrow
 * Owen Hester
 * Owlman (I-II)
 * Owlwoman
 * Ox
 * Oxygen
 * Oxygen (Warner Bros. Animation)
 * Ozymandias (also known as Adrian Veidt)
 * Ozymandias (also known as Adrian Veidt) (Warner Bros.)
 * Ozzie
 * Ozzie (Warner Bros. Animation (DCAU))
 * Ozzie Nelson