A vigilante, also known as a "mask", is an individual who takes the law into their own hands, believing that the police and the court system are unable and unreliable to bring criminals to justice. However, not all vigilantes are fighting for justice, some do it out of personal revenge and antagonistic reasoning. It is also common for vigilantes to take on a moniker to be known by, some by personal choice and others having been named by the public.
Known vigilantes
Earth-1 vigilantes
Heroes
- Ted Grant/Wildcat (retired)
Team Arrow
- John Diggle/Spartan
- Roy Harper/Arsenal
- Laurel Lance/Black Canary
- Quentin Lance/Detective
- M
- Oliver Queen/Green Arrow
- Thea Queen/Speedy
- Felicity Smoak
- Tatsu Yamashiro
Team Flash
- Barry Allen/Flash
- Cisco Ramon/Vibe
- Ronnie Raymond/Firestorm (deceased)
- Caitlin Snow
- Eddie Thawne (deceased)
Rip Hunter's team
- Carter Hall/Hawkman (deceased)
- Rip Hunter
- Jefferson Jackson/Firestorm
- Sara Lance/The Canary/White Canary
- Ray Palmer/The Atom
- Mick Rory/Heat Wave (anti-hero)
- Kendra Saunders/Hawkgirl
- Leonard Snart/Captain Cold (anti-hero)
- Martin Stein/Firestorm
Villains
- Helena Bertinelli/The Huntress (formerly; incarcerated)
- Carrie Cutter/Cupid (formerly; recruited by A.R.G.U.S.)
- Joseph Falk/The Savior (deceased)
- Malcolm Merlyn/Dark Archer/Ra's al Ghul
- Isaac Stanzler (deceased)
- Eobard Thawne/Reverse-Flash
- Slade Wilson/Deathstroke (formerly; incarcerated) (maybe recruited by A.R.G.U.S.)
The Hoods
- Aglin (formerly; incarcerated)
- Baker (formerly; incarcerated)
- Colton (formerly; incarcerated)
- Jeff Deveau (formerly; incarcerated)
Earth-2 vigilantes
Heroes
Villains
- Cisco Ramon/Reverb
- Ronnie Raymond/Deathstorm
- Caitlin Snow/Killer Frost
- Zoom