Secret identities

As a part of having an alter ego, individuals try to keep secret identities, often telling as few people as possible about their alternate identity. Below are lists of characters' secret identities, and who is aware of them.

Barry Allen/The Flash
After waking up from a coma, Barry Allen discovered he'd gained the power of super speed. Using this to his advantage, he eventually decided to become a guardian angel of Central City. The three S.T.A.R. Labs members that took care of him when he was unconscious decided to work with him.
 * 1) Eobard Thawne: One of the three S.T.A.R. Labs members that looked after Barry during his nine-month comatose state, however, Eobard already knew Barry would eventually become the Flash, as he is from the future and is the Reverse-Flash, the man who murdered Barry's mother.
 * 2) Caitlin Snow: She helped look after Barry during his nine-month comatose state.
 * 3) Cisco Ramon: He helped look after Barry during his nine-month comatose state.
 * 4) Oliver Queen: Before actually becoming the Flash, Barry consulted Oliver on what to do. Oliver motivated him to become the Flash, observing his super speed as he ran away.
 * 5) Joe West: Before Barry was shot by Clyde, Joe shot Clyde himself numerous times. He shortly discovered that Barry had been given his powers from the bolt of lightning that had struck him.
 * 6) Felicity Smoak: When Felicity visited Barry in Central City, he showed her his newfound abilities.
 * 7) Bette Sans Souci: After saving her from General Eiling, Barry reveal his identity to Bette and the fact that they are both metahumans.
 * 8) Wade Eiling: Eiling witnessed Barry without his mask on after shooting Bette Sans Souci.
 * 9) Tony Woodward: After defeating his childhood bully, Barry put Tony in The Pipeline and revealed himself.
 * 10) John Diggle: A few members of Team Arrow were in Central City on a mission; while waiting for Oliver to return, Diggle and Felicity were talking and the Flash sped up towards them, shocking Diggle (as he previously felt that the speed might have been exaggeration, until he finally saw it with his own eyes).
 * 11) Lyla Diggle: After coming to Starling City to help out Oliver, Barry accidentally let Lyla know that he was the Flash, assuming Diggle had told her.
 * 12) Roy Harper: Arriving back from getting sushi, Barry kept his mask off but the rest of his outfit on, allowing Roy to deduce his identity.
 * 13) Henry Allen: After piecing together a number of interactions with the Flash, Henry concluded that the Flash is Barry. Despite Barry shrugging the accusation off, Henry proceeded to admit how proud he was and assure that, if his son was actually the Flash, that he was doing real good. Only later did Barry reveal his identity after saving his father's life, to no surprise from either.
 * 14) Ronnie Raymond: He became aware of Barry's secret identity as he met him in S.T.A.R. Labs after the separation of Firestorm. He is no longer Firestorm, as he was replaced with Jefferson Jackson after he was killed saving Central City from the singularity.
 * 15) Martin Stein: He became aware of Barry's secret identity as he met him in S.T.A.R. Labs after the separation of Firestorm.
 * 16) Clarissa Stein: Upon seeing Barry using his speed to quickly get her husband a pizza, it is presumed that Clarissa was intelligent enough to link him and the Flash (who was on the news) as the same person.
 * 17) Leonard Snart: Leonard tortured Dante Ramon, forcing Cisco to reveal The Flash's identity in return for his brother's life.
 * 18) Eddie Thawne: Barry revealed his identity as the Flash to Eddie in order to have him help them get to the bottom of the mystery that is Dr. Wells.
 * 19) Ray Palmer: Needing help on his A.T.O.M. Exosuit, he and Felicity headed to S.T.A.R. Labs in Central City and Felicity had to reveal Barry's secret.
 * 20) Brie Larvan: It is assumed that she found out when Barry, unmasked, used his speed to capture the bee at S.T.A.R. Labs, with Brie seeing it through the camera on the bee.
 * 21) Laurel Lance: As Laurel & Cisco decide to talk privately, she tells him that she is aware of Barry's identity as The Flash.
 * 22) Hannibal Bates: Bates transformed into Barry and the Flash, explored S.T.A.R Labs, was considered part of the team, and put in the pipeline prison. It is implied that Bates pieced together Barry as the Flash.
 * 23) Gideon: Gideon is a sentient computer and knows Barry is the Flash, as he is her creator.
 * 24) Iris West: Iris concluded that the Flash is in fact Barry after feeling static electricity when trying to grab his hand, as she'd done previously with Barry, when the latter was in a coma for 9 months.
 * 25) Malcolm Merlyn: When Barry went to Nanda Parbat to rescue Team Arrow, Felicity called him by name, revealing his identity to Malcolm.
 * 26) Nora Allen: When Barry travels back in time to when his mother died, he reveals to her that he is Barry and the Flash.
 * 27) Hunter Zolomon: Zolomon appeared in S.T.A.R. Labs out of nowhere, revealing that he knew of Barry's identity, thus further implying his connection to The Flash also.
 * 28) Jefferson Jackson: After becoming Firestorm, it is clear that he knew Barry's identity.
 * 29) Harrison Wells: After saving The Flash from King Shark, Barry revealed his identity to him. However, it is implied that he already knew of his existence.
 * 30) Linda Park: After asking her to go up against Zoom, Barry decided that he needed to trust her completely in order for her to trust him likewise, thus revealing his secret identity.
 * 31) Kendra Saunders: Cisco accidentally revealed Barry's identity to Kendra after Barry saved him from being impaled in the chest when Vandal Savage threw a knife at him.
 * 32) Carter Hall: Carter saw Barry unmasked while being chained in the Arrowcave.
 * 33) Thea Queen: When Barry arrived in the Arrowcave with Team Arrow, he had his mask off.
 * 34) Vandal Savage: He came in to Oliver Queen's apartment and attacked Teams Arrow and Flash for Kendra Saunders, causing Barry to run super fast to protect his friends from Savage's daggers.
 * 35) Patty Spivot: Patty found files on The Flash in Barry's desk that were inaccessible to the CCPD, raising her suspicions of Barry and The Flash being the same person along with knowledge that Joe West and Barry secretly help S.T.A.R. Labs occasionally. Patty later confirmed Barry's identity as The Flash after she tricked him by claiming an armed man was on her train.
 * 36) Jesse Quick: Jesse saw Barry unmasked when they were captured by Zoom.
 * 37) Jay Garrick: After Barry was kidnapped by Zoom, the man saw Barry unmasked.
 * 38) Barry Allen (Earth Two): After being kidnapped by Barry, Cisco and Harrison, Barry was informed of everything that was going on, including doppelgangers identity.
 * 39) Iris West (Earth Two): Iris was filled in of everything that was going on, including Barry being The Flash by Barry, Cisco, and Harrison.
 * 40) Caitlin Snow (Earth Two): Caitlin saw Barry unmasked after helping Cisco, Harrison, Barry and Iris save him.
 * 41) Mari McCabe: After meeting Vixen, Green Arrow and the Flash maintained a friendship with her and revealed their identities. While visiting Star City she confirmed that she knew Barry's identity.
 * 42) Hartley Rathaway: In a recently altered timeline, Hartley save Barry from being killed by a Time Wraith.
 * 43) Kara Danvers: Barry revealed his identity to her after reaching her Earth and realizing that he wasn't on his own.
 * 44) James Olsen: After returning to Supergirl's base of operations, Barry revealed his identity to him.
 * 45) Winn Schlott: After returning to Supergirl's base of operations, Barry revealed his identity to him.
 * 46) Department of Extra-Normal Operations: After teaming up with Supergirl, she took him to the D.E.O. where he revealed his identity to Lucy Lane.
 * 47) Cat Grant: Cat was able to figure out the connection between Barry, the red suit and his longing for the hero to be named "The Flash".
 * 48) Tina McGee: After saving Dr. McGee from a collapsing building, she acknowledged that she knew his identity, reasoning that she wasn't an idiot and her occupation allowed her to make such observations.
 * 49) Wally West: After Zoom openly took Henry Allen in front of his family and friends, Barry raced after him, with Wally being shocked at the sudden revelation.

Sebastian Blood/Brother Blood

 * 1) Daily: As he was part of the Church of Blood, Daily was aware of Sebastian being Brother Blood.
 * 2) Cyrus Gold: As he was a childhood friend of Sebastian as well as part of the Church of Blood, Cyrus was aware of Sebastian being Brother Blood.
 * 3) Slade Wilson: As he is the leader of the Church of Blood, Slade is aware of Sebastian being Brother Blood.
 * 4) Isabel Rochev: As she was part of the Church of Blood, Isabel was aware of Sebastian being Brother Blood.
 * 5) Laurel Lance: Laurel first suspected Sebastian when she was investigating him after the death of Lucas Hilton. Later on, when she found out Sebastian wrote a press statement about Moira Queen's death, she learned that Sebastian was Brother Blood.
 * 6) John Diggle: Diggle learned through Laurel that Sebastian was Brother Blood.
 * 7) Felicity Smoak: Felicity learned through Laurel that Sebastian was Brother Blood.
 * 8) Oliver Queen: Oliver learned through Laurel that Sebastian was Brother Blood.
 * 9) Clinton Hogue: As he is Sebastian's former bodyguard, Clinton was aware of Sebastian being Brother Blood.

Ted Grant/Wildcat

 * 1) Isaac Stanzler: Isaac was aware of Ted's secret identity, as he was once the latter's partner and protégé.

John Diggle/Spartan

 * 1) Laurel Lance: Five months before Oliver became Green Arrow, Diggle became Spartan and showed his alter ego to his partners: Laurel and Thea.
 * 2) Thea Queen: Five months before Oliver became Green Arrow, Diggle became Spartan and showed his alter ego to his partners: Laurel and Thea.
 * 3) Felicity Smoak: When Laurel and Thea explained to Felicity and Oliver about The Ghosts, Oliver, Felicity, Laurel and Thea came back to Star City and Felicity saw Diggle with his suit
 * 4) Oliver Queen: When Laurel and Thea explained to Felicity and Oliver about The Ghosts, Oliver, Felicity, Laurel and Thea came back to Star City and Oliver saw Diggle with his suit.
 * 5) Quentin Lance: When Quentin joined Team Arrow, he discovered John's identity.
 * 6) Sara Lance: After Sara was resurrected she saw John in full Spartan get-up.
 * 7) Barry Allen: Barry saw John in full Spartan get-up after saving him.
 * 8) Vandal Savage: He came in Oliver's apartment and attack Team Arrow and Team Flash for Kendra Saunders.
 * 9) Mari McCabe: Mari met John and learned his secret identity when Oliver brought her to the Arrowcave.
 * 10) Samantha Clayton: Much like Mari, Samantha is also aware of John's alter-ego after Oliver took her down to the bunker.
 * 11) Damien Darhk:
 * 12) Andy Diggle:
 * 13) Roy Harper: Roy returned to Star City in 2016 and helped Team Arrow in the fight against the Calculator, fighting aside Spartan, though he already knew John's membership.
 * 14) Curtis Holt: When Curtis stumbled upon the Arrowcave, he discovered many secret identities, along with John's one.

Roy Harper/Arsenal

 * 1) Team Arrow: After Roy joined the team (during that time the members were; Oliver Queen, John Diggle, Felicity Smoak, and Sara Lance), they all became aware of his secret identity as he helped fight crime with them.
 * 2) Laurel Lance: When Laurel joined Team Arrow, she discovered Roy's identity.
 * 3) Nyssa al Ghul: When Nyssa temporarily joined Team Arrow, she became aware of Roy's identity.
 * 4) Barry Allen: When visiting Starling City to help The Arrow, Barry was allowed into the Arrowcave, thus becoming aware of Arsenal's identity.
 * 5) Caitlin Snow: When visiting Starling City to help The Arrow, Caitlin was allowed into the Arrowcave, thus becoming aware of Arsenal's identity.
 * 6) Cisco Ramon: When visiting Starling City to help The Arrow, Cisco was allowed into the Arrowcave, thus becoming aware of Arsenal's identity.
 * 7) Thea Queen: Thea was able to deduce that Roy was the red-hooded counterpart to The Arrow.
 * 8) Quentin Lance: Quentin was able to make the connection between Roy's red hoodie and working with the Arrow, therefore concluding him as Arsenal.

Jefferson "Jax" Jackson and Martin Stein/Firestorm

 * 1) Team Flash: Previously aware of Martin Stein's identity from his association with Ronnie Raymond, researched possible candidates to replace Ronnie as Firestorm, leading them to find Jax.
 * 2) Clarissa Stein: Became aware of Jax's identity as Martin's new partner offscreen shortly before or after the new Firestorm returned to Philadelphia.
 * 3) Henry Hewitt: Told by Caitlin about Firestorm's powers as he was the second potential metahuman partner to Stein. Found out about Jax's identity when the new Firestorm confronted him with The Flash.
 * 4) Rip Hunter: Being a Time Master Rip must have known about Firestorm to choose them for his team.
 * 5) Sara Lance: She saw Firestorm when the team battled Chronos.
 * 6) Ray Palmer: He saw Firestorm the team battled Chronos.
 * 7) Kendra Saunders: She saw Firestorm when the team battled Chronos.
 * 8) Carter Hall: He saw Firestorm when the team battled Chronos.
 * 9) Leonard Snart: He saw Firestorm when the team battled Chronos.
 * 10) Mick Rory:  He saw Firestorm when the team battled Chronos.
 * 11) Vandal Savage:
 * 12) Valentina Vostok:
 * 13) Connor Hawke:
 * 14) Ra's al Ghul:
 * 15) Jonah Hex:

Sara Lance/The Canary/White Canary
Sara began her duty as a vigilante called "The Canary". After resurrected from Lazarus Pit, she now goes by the name "White Canary".
 * 1) League of Assassins: The entire League, including the likes of Ra's al Ghul, Nyssa al Ghul and Al-Owal, were aware of Sara's vigilantism in Starling City, due to her having trained with them.
 * 2) Sin: After saving her from being raped by a group of men, Sara revealed her identity to Sin.
 * 3) Oliver Queen: Oliver trapped The Canary with a bunch of ropes attached to arrows, only to take off her mask to reveal Sara. He in turn revealed his identity.
 * 4) Team Arrow: When Sara joined Oliver's team, she met John Diggle and Felicity Smoak. Later when Roy Harper joined Team Arrow, he learned of Sara's secret.
 * 5) Quentin Lance: When the League of Assassins began to hunt Sara down, under orders from Nyssa al Ghul, Sara decided that the best way to protect her family was to reveal her secret identity, thus giving them a full idea of the dangerous situation. She revealed this to her father, who was initially shocked at her appearance, though accepting of her actions.
 * 6) A.R.G.U.S.: Amanda Waller and Lyla Diggle were aware of who Sara was and what she did.
 * 7) Slade Wilson: When Slade began to hunt down Oliver and destroy him, Oliver's team fought back. In the midst of this, Slade was made aware of Sara still being alive, and further inferred Sara's vigilantism.
 * 8) Laurel Lance: When Laurel saw Sara's injuries after Slade's attack, she was nearly heartbroken on learning this.
 * 9) Caitlin Snow: After Felicity gave her some evidence to process in regards to The Canary's death, Caitlin openly called her "Sara", somehow knowing who The Canary was. However it is possible that she learned Sara's identity when studying the DNA on the arrows.
 * 10) Cisco Ramon: As Caitlin openly named The Canary as Sara, either Cisco was already aware of her identity, or he became aware then.
 * 11) Thea Queen: After Sara was resurrected Thea saw her in full Canary get-up.
 * 12) Rip Hunter: As Rip is a Time Master he knew that Sara was the White Canary.
 * 13) Ray Palmer: Ray saw Sara in full Canary get-up when the team fought Chronos.
 * 14) Kendra Saunders: Kendra saw Sara in full Canary get-up when the team fought Chronos.
 * 15) Carter Hall: Carter saw Sara in full Canary get-up when the team fought Chronos.
 * 16) Leonard Snart: Leonard saw Sara in full Canary get-up in the bar.
 * 17) Mick Rory: Mick saw Sara in full Canary get-up in the bar.
 * 18) Jefferson Jackson: Jax saw Sara in full Canary get-up when the team fought Chronos.
 * 19) Martin Stein: Martin saw Sara in full Canary get-up when the team fought Chronos.
 * 20) Vandal Savage:
 * 21) Connor Hawke:
 * 22) Ra's al Ghul:
 * 23) Jonah Hex:

Laurel Lance/The Canary/Black Canary

 * 1) Roy Harper: Roy learned of her identity while stopping a mugger.
 * 2) John Diggle: Diggle learned of her identity after Roy helped her, which led to him finding out quickly.
 * 3) Felicity Smoak: Believing that The Canary was back, but it wasn't Sara, she discovered that it was in fact Laurel.
 * 4) Ted Grant: Ted inferred that Laurel was the Black Canary after watching the news.
 * 5) Oliver Queen: Oliver learned about Laurel's alter ego through his team.
 * 6) Quentin Lance: He was able to assume that Laurel was taking her sister's place as a vigilante while she way away, but later found out that Sara was in fact dead.
 * 7) Thea Queen: She found out after walking into the Foundry and seeing Laurel in costume after the latter was injected with Vertigo.
 * 8) Ray Palmer: Ray was able to infer that due to her attempts to keep The Arrow safe at all costs, she was the Black Canary.
 * 9) Barry Allen: Felicity explained that she had a complicated life, among that knowing that Laurel was the Black Canary.
 * 10) Cisco Ramon: Laurel told Cisco that she was the Black Canary when asking for his help with the Canary Cry.
 * 11) Tatsu Yamashiro: In Nanda Parbat, Laurel stood unmasked in front of Tatsu.
 * 12) John Constantine: When attempting to recover Sara Lance's soul, Laurel was dressed in her Black Canary outfit. It can be presumed that John can figure out her identity.
 * 13) Sara Lance: After she was resurrected Sara saw Laurel in full Black Canary get-up.
 * 14) Mari McCabe: Mari is aware of Laurel's alter-ego after Oliver took her down to the bunker.
 * 15) Samantha Clayton: Much like Mari, Samantha is also aware of Laurel's alter-ego after Oliver took her down to the bunker.
 * 16) Curtis Holt: After wishing to help Felicity during Brie Larvan 's attack on Palmer Technologies, he accidentally stumbled upon Team Arrow in their outfits.
 * 17) Damien Darhk: Having deduced that Oliver Queen was Green Arrow, Damien was able to figure out that Oliver's ex-girlfriend, Laurel, was Black Canary.
 * 18) Unidentified doctors: After Laurel was stabbed by Damien Darhk, Oliver was forced to take her to Starling General Hospital, where trauma doctors worked to save her but were forced to remove her uniform and mask.
 * 19) Andy Diggle:
 * 20) Dinah Lance: Identity was revealed by Oliver at Laurels funeral.
 * 21) Everyone: At Laurel's funeral, Oliver publicly reveals that Laurel was in fact the Black Canary and died a hero instead of a criminal that people thought she was due to someone masquerading as her killing people after she died in the hospital, this means Laurel being the Black Canary is no longer a secret.

Malcolm Merlyn/The Dark Archer/Ra's al Ghul

 * 1) League of Assassins: The entire league, including Ra's al Ghul, Nyssa al Ghul and Al-Owal, are aware of Malcolm's secret identity, and are all unhappy about what he'd done.
 * 2) Team Arrow: Following Malcolm's reveal to The Hood about him being The Dark Archer, Oliver's entire team is aware of Malcolm's alter-ego, consisting of Oliver Queen, John Diggle, Felicity Smoak, Laurel Lance, Sara Lance and Roy Harper.
 * 3) Tommy Merlyn: As they were being shot at by members of the Chinese Triad, Malcolm revealed his panic room to Tommy, fully equipped with his Dark Archer suit and equipment.
 * 4) Moira Queen: The Dark Archer vanished when Malcolm ‘Died’ in the undertaking. Malcolm revealed himself to Moira, wielding his bow. She then connected the dots.
 * 5) Thea Queen: As Thea was about to be attacked by one of Slade Wilson's army, Malcolm intervened and pulled off his mask to reveal his identity to her.
 * 6) Danny Brickwell: After Malcolm tracked down Brick and prepared to avenge his wife, he revealed his own identity during the confrontation.
 * 7) Ray Palmer: While trapped in Nanda Parbat, Ray saw Malcolm unmasked.
 * 8) Barry Allen:  He helped to rescue Malcolm and the rest of them from their dungeon in Nanda Parbat.
 * 9) Tatsu Yamashiro: In Nanda Parbat, Malcolm stood unmasked in front of Tatsu.
 * 10) Damien Darhk: When he confronts Thea it's revealed Damien knows Malcolm is the new Ra's al Ghul.
 * 11) Kendra Saunders: When facing Vandal Savage Malcolm appears in the Arrow Cave in full League get-up.
 * 12) Quentin Lance: While in the Arrowcave Malcolm tells Quentin straight up "I am Ra's al Ghul".

Ray Palmer/The Atom

 * 1) Felicity Smoak: After he'd been holed up trying to finish his exosuit, Ray caved and allowed Felicity to see his progress, while at the same time asking for her help in his endeavour.
 * 2) Oliver Queen: When Ray discovered the identity of The Arrow, Felicity came to tell Oliver about the suit he'd been making.
 * 3) Roy Harper: When Ray discovered the identity of The Arrow, Felicity came to tell Oliver about Ray's suit, while Roy listened in.
 * 4) Barry Allen: When Ray flew in to Central City, Barry saw him in full view as The Atom.
 * 5) Cisco Ramon: When Ray flew in to Central City, Cisco saw him in full view as The Atom.
 * 6) Caitlin Snow: When Ray flew in to Central City, Caitlin saw him in full view as The Atom.
 * 7) Eobard Thawne: When Ray flew in to Central City, Eobard saw him in full view as The Atom.
 * 8) John Diggle: When Oliver's team allied with Ray to take down a meta-human, Diggle seemed already aware of Ray's suit, as he was probably informed by the team.
 * 9) Malcolm Merlyn: While trapped in Nanda Parbat, Malcolm saw Ray unsuited.
 * 10) Tatsu Yamashiro: In Nanda Parbat, Tatsu saw Ray unsuited.
 * 11) Damien Darhk: Kidnapped a miniaturized Ray in his exosuit after intercepting his message to Felicity.
 * 12) Leonard Snart: Leonard saw Ray in full Atom get-up when the team fought Chronos.
 * 13) Mick Rory: Mick saw Ray in full Atom get-up when the team fought Chronos.
 * 14) Sara Lance: Sara saw Ray in full Atom get-up when the team fought Chronos.
 * 15) Kendra Saunders: Kendra saw Ray in full Atom get-up when the team fought Chronos.
 * 16) Carter Hall: Carter saw Ray in full Atom get-up when the team fought Chronos.
 * 17) Jefferson Jackson: Jax saw Ray in full Atom get-up when the team fought Chronos.
 * 18) Martin Stein: Martin saw Ray in full Atom get-up when the team fought Chronos.
 * 19) Rip Hunter: As a Time Master Rip knew about Ray as he was chosen for the team.
 * 20) Vandal Savage:
 * 21) Connor Hawke:
 * 22) Ra's al Ghul:
 * 23) Jonah Hex:

Oliver Queen/The Hood/The Arrow/Al Sah-him/Green Arrow
Oliver initially acted as a vigilante known as The Hood. A year later he began to be known as a hero, The Arrow. However, 2 years later Oliver joined the League of Assassins, apparently becoming a darker version of himself, known as Al Sah-him. 6 months after coming out of retirement, Oliver now goes under the codename Green Arrow.
 * 1) Lodai: Since Lodai is Oliver's supplier for all of his vigilante equipment and activities, it is very likely that he is aware of Oliver's secret identity.
 * 2) John Diggle: Oliver was forced to reveal his identity as The Hood when Diggle was shot by Deadshot, and had to recuperate in Oliver's base after being given medicine. Diggle initially did not accept Oliver's vigilantism, but later was accepting and joined Oliver's vigilante team.
 * 3) Quentin Lance: Quentin had originally discovered Oliver's secret through a security camera from the Exchange Building, unknown to Quentin, Oliver set the whole thing up, to exonerate himself, his belief that Oliver is the Hood, was proven to be (seemingly) untrue when the Vigilante, appeared on the other side of town, well the former was under house arrest at the time, however it was actually Oliver's bodyguard John Diggle. 2 years later when Quentin ordered a manhunt on the Arrow (who was being framed by the League of Assassins for murder), Ra's al Ghul had him kidnapped and told him Oliver's secret, hoping to further turn the city against Oliver. They got partway to taking him to prison, but Roy Harper intervened wearing the suit (despite Quentin's having seen him in his own suit).
 * 4) Derek Reston: After saving his son, Derek was shot, and in his dying moments Oliver decided to reveal his identity to him.
 * 5) Helena Bertinelli: After Oliver realized that Helena was The Huntress, he helped save her, and she in turn discovered The Hood's identity. Helena joined Oliver's team, helping to fight crime, however she was too blinded by her hatred for her father, and left.
 * 6) Felicity Smoak: Following Oliver being shot by Moira Queen when he tried interrogating her, he lay in the back of Felicity's car with a wound. He revealed his identity to her, and the two of them drove to Robert Queen's warehouse, where Oliver's base lay beneath. Once there, Felicity and Diggle operated on him.
 * 7) Tommy Merlyn: When his father, Malcolm, was shot by Deadshot, Oliver revealed his identity to Tommy in order to trust him to save his father's life. Tommy was conflicted over Oliver's revelation and often argued with him over his actions, though Tommy ultimately kept the secret.
 * 8) Webb: After trying to stop the production of Vertigo, Oliver was drugged with it and knocked out. He was strapped down, only to escape and kill Dr. Webb.
 * 9) Webb's accomplice: When Dr. Webb trapped Oliver, the two of them learnt his true identity. He was ultimately killed by John Diggle when he escaped.
 * 10) Malcolm Merlyn: Oliver went after Malcolm, who revealed his identity as The Dark Archer. Malcolm ultimately won the fight, pulling off Oliver's hood in shock.
 * 11) Sara Lance: For over a year Sara suspected Oliver to be The Hood, later The Arrow, and she finally discovered that her suspicions were true when her identity was revealed to Oliver. She joined Oliver's team not long after that.
 * 12) Al-Owal: Al-Owal broke in to the Queen Mansion while Sara was staying there. Not only did he know of her whereabouts, but he also knew of Oliver's alter ego, The Arrow. It's possible he knew it due to Malcolm, his former protégé, knowing it.
 * 13) A.R.G.U.S.: Some members of A.R.G.U.S., including the likes of Amanda Waller and former member Lyla Diggle, are aware of Oliver's secret identity, as well as his associates, John Diggle and Felicity Smoak.
 * 14) Count Vertigo: Count Vertigo was able to deduce Oliver's identity as The Arrow solely due to his large connection to Felicity Smoak, who also had a large connection to The Arrow. He used his knowledge of this connection to lure Oliver to Queen Consolidated, where Oliver confirmed his ideas of Oliver's identity, only to be killed when Count Vertigo almost killed Felicity.
 * 15) Barry Allen: Felicity and Diggle made the call to reveal Oliver's secret identity to Barry when Oliver was poisoned by unknown chemicals from an A.R.G.U.S. disaster bunker, following his fight with a Mirakuru-enhanced Cyrus Gold. Oliver was annoyed at this, though soon came to terms with it and accepted Barry.
 * 16) Slade Wilson: For the entire time that Oliver acted as The Hood, then The Arrow, Slade had figured that he was indeed Oliver, due to the green hood's significance - a reference to that of Yao Fei's and Shado's hood. He made it his sole purpose to destroy Oliver's life and reverse his heroic deeds.
 * 17) League of Assassins: The entirety of League of Assassins, including the likes of Ra's al Ghul, Nyssa al Ghul and Maseo Yamashiro who know about Oliver as The Arrow.
 * 18) Roy Harper: Oliver was forced to reveal his secret identity to a Mirakuru-enhanced Roy in order to calm him down, to stop him from beating Ben Turner to death. Roy later joined Oliver's team, but left the team, because he (correctly) blamed Oliver for Thea getting kidnapped by Slade Wilson. He later rejoined after they get the Mirakuru out of him and becomes Oliver's partner.
 * 19) Isabel Rochev: Due to being in league with Slade Wilson, a fact which she eventually revealed to Oliver, Isabel was aware of Oliver being The Arrow.
 * 20) Laurel Lance: When Slade Wilson began publicly ruining Oliver's life, he turned up at Laurel's door to tell her of Oliver's identity as The Arrow. Laurel was initially shocked and began to add up the clues, but after advice from her father, decided that it was best to not approach Oliver about it and allow him to do his job.
 * 21) Moira Queen: While having a conversation about Thea, Moira also revealed to Oliver that she had figured that Oliver was the vigilante since around the events of The Undertaking, and before Oliver could say a thing, Moira expressed that she couldn't be prouder.
 * 22) Sebastian Blood: When having dinner, Sebastian was joined by Oliver who started a conversation about Slade Wilson before saying “I'm the Arrow”. Sebastian didn't seem overly surprised at the discovery.
 * 23) Eobard Thawne:  After The Arrow and his team came to Central City to help The Flash and his team, Eobard wished to learn The Arrow's identity in order to put his faith in him, though Felicity reasoned that it wasn't her secret to tell. However, he was later able to simply guess who he was to Felicity (possibly using his knowledge of the future).
 * 24) Joe West: Eobard was able to simply guess The Arrow's identity in front of him, Felicity confirms it.
 * 25) Caitlin Snow: Eobard was able to simply guess The Arrow's identity in front of her, Felicity confirms it.
 * 26) Cisco Ramon: Eobard was able to simply guess The Arrow's identity in front of him, Felicity confirms it.
 * 27) Thea Queen: Oliver revealed his identity after he decided that it was safer if she knew, what with the threat of Ra's al Ghul.
 * 28) Ray Palmer: He tracked down The Arrow and used his helmet's x-ray vision to see Oliver's face.
 * 29) Firestorm (Ronnie Raymond and Martin Stein): Firestorm saw Oliver unmasked during the battle with the Reverse-Flash.
 * 30) John Constantine: When attempting to recover Sara Lance's soul, Oliver was dressed in his Green Arrow suit. it can be presumed that John can figure out his identity.
 * 31) Kendra Saunders: Kendra saw Oliver unmasked when Thea introduced him to her.
 * 32) Carter Hall: Carter saw Oliver unmasked while being chained in Arrowcave.
 * 33) Vandal Savage: He came in Oliver's apartment and attacked Team Arrow and Team Flash for Kendra Saunders.
 * 34) Mari McCabe: After meeting Vixen, Green Arrow and the Flash maintained a friendship with her and revealed their identities. While visiting Star City she confirmed that she knew Oliver's identity.
 * 35) Samantha Clayton: When asking what Oliver was going to do to get William back after his kidnapping, Oliver revealed his identity as Green Arrow to her.
 * 36) Jefferson Jackson: When being attacked by Conner Hawke, Sara Lance mentioned that that Green Arrow is not Oliver Queen, giving away his identity.
 * 37) Leonard Snart: When being attacked by Conner Hawke, Sara Lance mentioned that that Green Arrow is not Oliver Queen, giving away his identity.
 * 38) Mick Rory: When being attacked by Conner Hawke, Sara Lance mentioned that that Green Arrow is not Oliver Queen, giving away his identity
 * 39) Rip Hunter: Coming from the year 2166, it is highly likely Rip has knowledge on who heroes identities are, including Oliver Queen.
 * 40) Curtis Holt: After wishing to help Felicity during Brie Larvan's attack on Palmer Technologies, he accidentally stumbled upon Team Arrow in their outfits.
 * 41) Damien Darhk: After Team Arrow came after William, Oliver's son, Damien deduced that this was the case, believing the look in Oliver's eyes to be that of a father's. It was only later during his incarceration that he revealed his knowledge to Oliver.
 * 42) Andy Diggle:

Thea Queen/Speedy

 * 1) John Diggle: Thea saved Diggle from being killed by a thug of Ra's al Ghul's, in full Speedy get-up.
 * 2) Oliver Queen: After defeating Ra's al Ghul, Thea stood with the others, unmasked. He also suggested her to take up the name "Speedy" and asked the rest of Team Arrow to call her that.
 * 3) Laurel Lance: After defeating Ra's al Ghul, Thea stood with the others, unmasked.
 * 4) Felicity Smoak: After defeating Ra's al Ghul, Thea stood with the others, unmasked.
 * 5) Ray Palmer: After defeating Ra's al Ghul, Thea stood with the others, unmasked.
 * 6) Malcolm Merlyn: After defeating Ra's al Ghul, Thea stood with the others, unmasked.
 * 7) Nyssa al Ghul: After defeating Nyssa's father, Thea stood with the others, unmasked.
 * 8) Sara Lance: After being resurrected Sara sees Thea in full Speedy get-up.
 * 9) Barry Allen: After rescuing Oliver, Barry and Team Arrow returned to the Arrowcave with Thea unmasked
 * 10) Cisco Ramon: After entering the Arrowcave, Cisco saw Thea unmasked.
 * 11) Kendra Saunders: After entering the Arrowcave, Kendra saw Thea unmasked.
 * 12) Carter Hall: Carter saw Thea unmasked while chained up in the Arrowcave.
 * 13) Mari McCabe: Mari is aware of John's alter-ego after Oliver took her down to the bunker.
 * 14) Samantha Clayton: Much like Mari, Samantha is also aware of Thea's alter-ego after Oliver took her down to the bunker.
 * 15) Curtis Holt: After wishing to help Felicity during Brie Larvan's attack on Palmer Technologies, he accidentally stumbled upon Team Arrow in their outfits.
 * 16) Damien Darhk: Having deduced that Oliver Queen was the Green Arrow, Darhk was able to figure out that Oliver's sister, Thea, was Speedy.
 * 17) Roy Harper:
 * 18) Andy Diggle:

Ronnie Raymond and Martin Stein/Firestorm

 * 1) Caitlin Snow: After Firestorm had stalked Caitlin, she followed him back to the Central City Shopping Mall garage, discovering that Ronnie was alive. However, wanting her to stay away, he used his pyrokinesis to create fire. She later learnt of the full nature of Firestorm from Cisco Ramon: that the two had merged.
 * 2) Cisco Ramon: After tracking him down in to sewers, Firestorm used his fire again to distract the two and run off. He later learnt from Hartley Rathaway the true nature of Firestorm, that the two men had merged.
 * 3) Barry Allen: Firestorm saved Barry during his fight with the Reverse-Flash, before flying away through the use of his flames.
 * 4) Eobard Thawne: Eobard learned of the merging of Stein and Ronnie through his scientists, eventually figuring a way to allow them to separate temporarily, and then merge willingly to create harmony.
 * 5) Hartley Rathaway: Hartley discovered that Ronnie and Stein had merged through CCTV footage of the accident.
 * 6) Clarissa Stein: Barry's team explained to her about her husband's condition, and used her to convince Firestorm to let their team help them.
 * 7) Wade Eiling: Eiling knew of the F.I.R.E.S.T.O.R.M. program, and kidnapped Martin Stein so he could weaponize what made Firestorm so valuable.
 * 8) Iris West: Iris researched the "burning man" as part of her job and sensed a connection between him and Caitlin. When Iris discovered Barry's secret, Caitlin confirmed her theories.
 * 9) Oliver Queen: Oliver battled the Reverse-Flash with Firestorm and The Flash.
 * 10) Jefferson Jackson: After Team Flash convinced Jax to become the new Firestorm, Caitlin revealed that Martin Stein's old partner was Ronnie, who died closing the singularity and that was part of what convinced Jax to take up the new mantle.

Eobard Thawne/Reverse-Flash

 * 1) Gideon: Gideon is a sentient computer friend of Eobard's and she knows of all his plans and that he's the Reverse-Flash.
 * 2) Wade Eiling: Eiling was abducted by Eobard and taken to the sewer where Grodd resides, and there he unmasked himself to General Eiling.
 * 3) Grodd: When Eobard brought General Eiling to the sewer, he unmasked himself, just before Grodd attacked Eiling, though it is likely Grodd knew ahead of time.
 * 4) Cisco Ramon: After Cisco picked up some high tachyon readings, he found Eobard's secret room along with his Reverse-Flash suit and a newspaper from 2024. Using memories of an alternate timeline, he discovered the truth and his identity of Eobard Thawne.
 * 5) Barry Allen: After Cisco picked up some high tachyon readings, he found Eobard's secret room along with his Reverse-Flash suit and a newspaper from 2024.
 * 6) Caitlin Snow: After Cisco picked up some high tachyon readings, she found Eobard's secret room along with his Reverse-Flash suit and a newspaper from 2024.
 * 7) Joe West: After having long-held suspicions, they were confirmed by Barry's team.
 * 8) Hannibal Bates: Promised his freedom, Bates pretended to be Eobard and confessed to being the Reverse-Flash. However, he was ultimately killed, all of it having been set up.
 * 9) Eddie Thawne: After having suspicions along with the team, Eobard kidnapped Eddie and revealed his identity, also adding that the two are related.
 * 10) Iris West: Barry revealed to Iris in passing conversation that "Wells" was the man in yellow, the same one that killed his mother.
 * 11) Firestorm: Firestorm flew in and watched Eobard turn into The Reverse-Flash. However, it was likely that they were aware ahead of time.
 * 12) Oliver Queen: Oliver jumped in and watched Eobard turn into the Reverse-Flash. However, it was likely that he was aware ahead of time.

Hunter Zolomon/Zoom

 * 1) Jay Garrick: After he travelled between Earths, Hunter captured Jay and stole his identity on his own Earth.
 * 2) Cisco Ramon: When the team learned that Zoom needed the Speed Force for survival, Cisco vibed and saw Zoom unmasked.
 * 3) Team Flash: After Cisco vibed Zoom unmasked, he told the rest of the team Zoom's identity.
 * 4) Laurel Lance (Earth Two): Due to being a high trusted lieutenent in his meta-human group, Laurel knew who Zoom was as she was seen talking to him while he was unmasked.
 * 5) Wally West: After Zoom decided to take Joe hostage to force Barry into racing him on the Magnetar, when Zoom and Barry met up beforce they raced Team Flash came along with him including Wally which he saw Zoom unmasked with Joe next to him.