Just now, I was over on the Batman board at DC's own forums, and I ran across a thread on this topic. Several people had posted lots of different names, but nobody had tried to "organize" them. I decided it wouldn't take long for me to put them in alphabetical order and throw in a few additions of my own, as a community service. So I did. I'm sure I'm missing some people, and I may have made mistakes in the people included on this draft of the list. I welcome any constructive criticism! I only wrote this on the spur of the moment, mainly drawing upon other people's comments on the subject! Could be plenty of room for error! I sorted the names alphabetically, either by a person's costumed alias or else by the first letter of the first name. Alfred Pennyworth Aquaman I (Orin) Azrael (Jean Paul Valley, AKA Batman II, now dead) Bane Batgirl III (Cassandra Cain) Bird Black Lightning (Jefferson Pierce) Booster Gold (Michael Carter) Cain (David Cain, the assassin) Catwoman I (Selina Kyle) The Crime Doctor (Bradford Thorne. Learned in his first appearance in 1980. I don't know if he still knows in modern continuity) Damian (Batman's newly discovered long-lost son) Deacon Blackfire (knew in "The Cult" but that story was later, allegedly, erased from continuity) Deadman (Boston Brand) Deathstroke the Terminator (Slade Wilson) Flash III (Wally West) Geo-Force (Brion Markov) Green Lantern #whatever (Hal Jordan) Halo (Violet Harper) Harold Allnut (dead) Hawkgirl (Kendra Saunders) Henri Ducard (knew during "Blind Justice," but that story was allegedly erased from continuity) Hugo Strange (kinda-sorta-sometimes thinks he knows, but -- as far as I can tell in the modern continuity -- has never actually proven it for sure. For instance, he's never captured Batman and then ripped off his cowl to reveal the face of Bruce Wayne underneath) Hush (Tommy Elliot) Ion (Kyle Rayner, formerly Green Lantern #whatever) Jack Drake (dead) Jason Todd (AKA Robin II, Nightwing, and the Red Hood) Jeannie Bowen (in "Blind Justice," which was allegedly erased from continuity later) Katana (Tatsu Yamashiro) Lady Shiva (Sandra Woosan) Leslie Thompkins Lois Lane Martian Manhunter (J'onn J'onnz) Metamorpho (Rex Mason) Nyssa Raatko (AKA Ra's al Ghul II. Dead) Oracle (Barbara Gordon) Owlman (Thomas Wayne of the Earth of the Antimatter Universe) Plastic Man (Eel O'Brian) The Question (Vic Sage) Ra's al Ghul (dead) Riddler (Edward Nigma, although those memories may be blocked at the moment, or else he's implicitly pretending they are, in Dini's current run on Detective Comics) Robin III (Tim Drake) Roy Kane (In "Blind Justice," but that story was allegedly erased from continuity. Anyway, he died at the end of it) Sasha Bordeaux Silver St. Cloud The Spectre #whatever (Crispus Allen) Spoiler (Stephanie Brown, AKA Robin IV, now dead) Superboy-Prime (the Clark Kent of Earth-Prime) Supergirl #whatever (Kara Zor-El, the Rebooted Version) Superman (Clark Kent, Kal-El) Talia Trogg Wonder Woman I (Diana) Zombie A few notes: In the early 1980s, when I was reading the first Marv Wolfman/George Perez run on "The New Teen Titans," it was clear that everybody in the group knew that Robin (later Nightwing) was Dick Grayson, and that Bruce Wayne was Batman. I have heard that later, maybe around the time of Zero Hour, Denny O'Neil tried to retcon that to say that NONE of the other Titans had ever known who Batman was. Period! So I'm not clear on how many current or former Titans are supposed to know who Batman is, right now, in modern continuity. Likewise, when Tim Drake was with Young Justice, he was under strict orders not to reveal any of Batman's secrets to his new teammates. It has never been firmly established that Jim Gordon knows. It's been hinted at a few dozen times, but he has never said (or even thought to himself), "There goes Batman, otherwise known as Bruce Wayne!" I didn't bother listing all the people from Pre-COIE Earth-2 who would know (including the Golden Age versions of Lois and Clark, who both died in IC) I listed Owlman from Grant Morrison's "Earth-2" -- but I don't know how many of his buddies in the Crime Syndicate of America know his secret identity. Any of them who did know could use that to deduce that Bruce Wayne is Batman in the main Earth of the DCU. I left off Anarky because nobody's told me yet when he is supposed to have found out. If someone can steer me to the right issue, I'll add him to a future version of the list.