Oliver initially acted as a vigilante known as the Hood. A year later he began to be known as a hero, the Arrow. 6 months after coming out of retirement, Oliver now goes under the codename Green Arrow. He revealed his identity to the public as part of the deal he made with the FBI to gain their aid against Ricardo Diaz.
- Talia al Ghul: After Talia rescued Oliver from Ishmael Gregor in Russia. She gave Oliver the hood, suit, and bow and trained him to become a vigilante.
- 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.
- John Diggle: Oliver was forced to reveal his identity as the Hood when John was shot by Deadshot, and had to recuperate in Oliver's base after being given medicine. John initially did not accept Oliver's vigilantism, but later was accepting and joined Oliver's vigilante team.
- 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).
- Derek Reston: After saving his son, Kyle, Derek was shot and in his dying moments Oliver decided to reveal his identity to him.
- 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.
- Felicity Smoak: Following Oliver being shot by his mother, 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 John operated on him.
- Tommy Merlyn: When his father, Malcolm Merlyn, 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, although Tommy ultimately kept the secret.
- 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.
- Webb's accomplice: When Dr. Webb trapped Oliver, the two of them learned his true identity. He was ultimately killed by John Diggle when he escaped.
- 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.
- 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.
- Al-Owal: Al-Owal broke into 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.
- Amanda Waller Amanda is aware of Oliver's identity as the Arrow.
- Lyla Michaels Lyla is aware of Oliver's identity as the Arrow.
- A.R.G.U.S.: Some members of A.R.G.U.S. are aware of Oliver's identity as the Arrow.
- Cecil Adams: Cecil 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 the Count almost killed Felicity.
- Barry Allen: Felicity and John 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, although soon came to terms with it and accepted Barry.
- 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 and Shado's hood. He made it his sole purpose to destroy Oliver's life and reverse his heroic deeds.
- Ra's al Ghul: Ra's is aware of Oliver's identity as the Arrow.
- Nyssa al Ghul: Nyssa is aware of Oliver's identity as the Arrow.
- Maseo Yamashiro: Maseo is aware of Oliver's identity as the Arrow.
- League of Assassins: All members of the League of Assassins are aware of Oliver's identity as the Arrow.
- 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 the team after they get the Mirakuru out of him and becomes Oliver's partner.
- Isabel Rochev: Due to being in league with Slade Wilson, a fact which she eventually revealed to Oliver; Isabel was aware of Oliver's identity as the Arrow.
- 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.
- Moira Queen: While having a conversation about Thea, Moira also revealed to Oliver that she had figured that Oliver is the Arrow since around the events of the Undertaking, and before Oliver could say a thing, Moira expressed that she couldn't be prouder.[24]
- 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, even stating that it explained a lot.
- 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).
- Joe West: Eobard was able to simply guess the Arrow's identity in front of everyone members and associates of Team Flash, Felicity confirms it.
- Caitlin Snow: Eobard was able to simply guess the Arrow's identity in front of everyone members and associates of Team Flash, Felicity confirms it.
- Cisco Ramon: Eobard was able to simply guess the Arrow's identity in front of everyone members and associates of Team Flash, Felicity confirms it.
- 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.
- Ray Palmer: Ray tracked down the Arrow and used his helmet's x-ray vision to see Oliver's face.
- Ronnie Raymond: Ronnie in his Firestorm form, saw Oliver unmasked during the battle with the Reverse-Flash.
- Martin Stein: Martin in his Firestorm form, saw Oliver unmasked during the battle with the Reverse-Flash.
- John Constantine: When attempting to recover Sara Lance's soul, Oliver was dressed in his Green Arrow suit. Assuming he wasn't already aware, it can be presumed that John can figure out his identity.
- Kendra Saunders: Kendra saw Oliver unmasked when Thea introduced him to her.
- Carter Hall: Carter saw Oliver unmasked while being chained in Arrowcave.
- Vandal Savage: Vandal came in Oliver's apartment and attacked Team Arrow and Team Flash for Kendra Saunders.
- Mari: 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.
- 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.
- Jefferson Jackson: When being attacked by Conner Hawke, Sara mentioned that Green Arrow is not Oliver, giving away his identity.
- Leonard Snart: When being attacked by Conner Hawke, Sara mentioned that Green Arrow is not Oliver, giving away his identity.
- Mick Rory: When being attacked by Conner Hawke, Sara mentioned that Green Arrow is not Oliver, giving away his identity.
- Rip Hunter: Coming from the year 2166, it is highly likely that Rip has knowledge on who heroes identities are, including that Oliver is Green Arrow.
- Curtis Holt: After wishing to help Felicity during Brie Larvan's attack on Palmer Technologies, he accidentally stumbled upon Team Arrow in their outfits.
- Damien Darhk: After Team Arrow came after William Clayton, Oliver's son, Damien deduced that this was the case, believing the look in Green Arrow's eyes to be that of a father's. It was only later during his incarceration that he revealed his discovery to Oliver.
- Andy Diggle: Andy learned of all the alter-egos of Team Arrow after he was reunited with John.
- Elisa Schwartz: When Oliver brought Laurel, who was still suited up as Black Canary, to the hospital as Green Arrow, he presumably returned to wait outside her operating room as Oliver, which both later readdressed.
- Evelyn Sharp: Oliver revealed his identity to Evelyn in order to build trust that he was risking losing due to his brutal training methods.
- Rene Ramirez: Oliver revealed his identity to Rene in order to build trust that he was risking losing due to his brutal training methods.
- Nate Heywood: When seeking help to recover the missing Legends, Nate revealed that he had figured out that Oliver is Green Arrow, piecing together when the archer returned to the city and when Oliver did.
- Rory Regan: After joining Team Arrow Oliver revealed his identity to Rory.
- Christopher Chance: After faking Oliver's death, Christopher was taken down to the Arrowcave, where he found out that Oliver was Green Arrow, although it is presumed he already knew.
- Tobias Church: After kidnapping Rene Ramirez Church tortured Rene to get the identity of Green Arrow.
- Adrian Chase: Before killing Tobias Church, he revealed to Adrian (under the guise of Prometheus) the identity of Green Arrow. However, it is later revealed that Adrian was already aware of Oliver being a vigilante; as he somehow knows of his secret previous identities; as the Hood and the Arrow respectively.
- Kara Danvers: After traveling to Earth-1 to help with the Dominators, Oliver confirmed his identity as Green Arrow to Kara.
- Iris West-Allen: After coming together to fight the Dominators, Barry confirmed Oliver's identity as Green Arrow to Iris.
- H.R. Wells: After everyone gathered to help with the Dominators, H.R. overheard Oliver confirming his identity as Green Arrow.
- Amaya Jiwe: Amaya was present when Oliver revealed his identity to everyone at the S.T.A.R. Labs hall.
- Billy Malone: When Adrian as Prometheus dressed up Malone as his decoy, Adrian attached a speaker to his chest with a recording mentioning Oliver's name, before being accidentally killed by Oliver himself.
- Laurel Lance (Earth-2): After Adrian as Prometheus freed her from the Pipeline at S.T.A.R. Labs, he had her pretend to be the Laurel from Earth-1.
- Dinah Drake: Oliver revealed who he was to Dinah in order to gain her trust.
- Susan Williams: Susan was able to deduce that Oliver is Green Arrow by piecing together photos of him in Russia at the same time that a hooded archer was there. She later asked Oliver, and although he denied it, she was publicly outed as a supposed fraud, leading her to believe that it was poor timing on Oliver's part, thus confirming the truth.
- Anatoly Knyazev: Oliver informed Anatoly of his identity as Green Arrow (off-screen).
- William Clayton: William saw Oliver unmasked in his Green Arrow suit.
- Cayden James: Cayden is aware of Oliver's identity as Green Arrow.
- Sheck: Sheck is aware of Oliver's identity as Green Arrow.
- Vincent Sobel: Vincent is aware of Oliver's identity as Green Arrow.
- Ricardo Diaz: Ricardo is aware of Oliver's identity as Green Arrow.
- Oliver (Earth-X): Dark Arrow was aware of Oliver's identity as Green Arrow; due to the fact he is his doppelganger.
- Kara (Earth-X): Overgirl was aware of Oliver's identity as Green Arrow.
- Ray Terrill: Ray saw Oliver unmasked in his Green Arrow suit, in a Nazi concentration camp on Earth-X.
- Sturmbannführer: The Sturmbannführer saw Oliver unmasked in his Green Arrow suit, in a Nazi concentration camp on Earth-X.
- Leo Snart: Leo saw Oliver unmasked in his Green Arrow suit, when he came to save Ray and Earth-1 heroes.
- Winn Schott (Earth-X): Winn saw Oliver unmasked in his Green Arrow suit, in headquarters of the Freedom Fighters.
- Zari Tarazi: Zari is possibly aware of Oliver's identity as Green Arrow.
- Kimberly Hill: Kimberly is possibly aware of Oliver's identity as Green Arrow; due to her being under Ricardo Diaz's payroll.
- P. Parks: Parks is possibly aware of Oliver's identity as Green Arrow; due to him being under Ricardo Diaz's payroll.
- Sam Armand: Sam is possibly aware of Oliver's identity as Green Arrow; due to him being under Ricardo Diaz's payroll.
- Kullens: Kullens is possibly aware of Oliver's identity as Green Arrow; due to him being under Ricardo Diaz's payroll.
- Raisa: Raisa indicated to Felicity that she was well aware of Oliver's status as a vigilante.[25]
- Jean Loring: Defending him on trial, Oliver admitted to Jean that he is Green Arrow; after she asked.[25]
- Samanda Watson: After he came to her asking she would help him and his team in stopping Ricardo Diaz, Oliver confessed to Samanda that he is Green Arrow.[26]
- FBI: While unconfirmed it's possible that most members of the FBI are aware of Oliver's identity as Green Arrow.
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