t This article list all the known enemies of the Flash, a fictional character.

Golden Age The Golden Age Flash enemies were all villains of the first Flash, Jay Garrick, later portrayed as living on Earth-Two after the introduction of the Silver Age Flash.

In chronological order (with issue and date of first appearance): Villain First appearance Description Shade Flash Comics #33 (September 1942) A villain who makes use of a special cane that enables him to cast complete darkness at will. Reformed in the 1990s Starman (vol. 2) series. Rag Doll Flash Comics #36 (December 1942) Peter Merkel was born "triple-jointed", which enable him to flex farther than a normal human. His son, Peter Merkel Jr., possesses similar abilities and is a member of the Secret Six. Eel Comic Cavalcade #3 (June 1943) "Eel" Madden was a criminal who had a grease gun, which made it almost impossible for anyone to catch him. Thinker All-Flash #12 (September 1943) Clifford DeVoe, a former DA, was a villain who used a specially designed "thinking cap" as an aid in conjuring up and performing various crimes, and a founding member of the Injustice Society of the World, in which position he captured the Flash. He later became friends with the Flash before dying from cancer; however, his Thinking Cap technology had become a computer program that became an independent villain. Turtle All-Flash #21 (January/February 1946) A villain who used slowness-related weapons against the Flash. He later resurfaced, gaining the ability to take away speed from people. In post-Flashpoint continuity, Turtle is a conduit of the Still Force and is able to nullify any form of motion. Dmane Flash Comics Miniature Edition (April 1946) A criminal from the 70th century who is accidentally sent to 1946 by a time travel experiment. The Flash is finally able to send him back just before his execution. Changeling Flash Comics #84 (June 1947) Nothing is known of the life of Erik Razar before he became a small-time gangster in Keystone City. In the early 1940s, Razar ran a small mob that was taken over by gangster Topper Hull. Hull framed Razar and had sent him to prison. In the summer of 1947, Razar hatched a plan to escape by sabotaging the prison power generator. His plan had an unforeseen side effect, charging Razar with enormous amounts of electricity and giving him the ability to transform into animals. Rose and Thorn Flash Comics #89 (November 1947) Rose Canton had an alternate personality, Thorn, who was a villain and used thorn-themed weapons. She married Alan Scott, the first Green Lantern, had two children named Jade and Obsidian, and later committed suicide. Her suicide was undone by Flashpoint and she is now depicted as a schoolgirl. Fiddler All-Flash #32 (January 1948) Isaac Bowin was a villain who used a violin to perform crimes, usually by using the violin to hypnotize people or cause vibrations which could shatter objects after learning skills from a fakir he was in prison with, before murdering him. He first tried to frame his brother, but was defeated and pretended to commit suicide. Fiddler later joined the Secret Six, but when he failed a mission, he was killed by Deadshot on the orders of their leader, Mockingbird. After his death, a woman found his violin and is now using it, calling herself Virtuoso. Star Sapphire All-Flash #32 (January 1948) A queen of the Seventh Dimension, she tried to take over the Earth twice but failed. She is now trapped in the Gem. The Rival Flash Comics #104 (February 1949) Dr. Edward Clariss, a professor at the university attended by Jay Garrick, believed he had recreated the formula that gave Garrick his speed which he called "Velocity 9". However, this formula was only temporary and he was defeated despite trying to use different fumes to take away the Flash's speed. Later, he escaped from jail, but went into the Speed Force itself. He is now pure energy from the Speed Force.

Silver Age The Silver Age Flash enemies all lived on Earth-One and started out as enemies of the second Flash, Barry Allen, as well as the third Flash, Wally West, and the fourth, Bart Allen, after the death of Barry Allen. The Silver Age is when some enemies started to use the name "Rogues". Originally, the Rogues were just a few of the Flash's enemies teaming together, but since then they have formed a lasting team, and usually a Rogue will not commit a crime by himself. The original eight Rogues were Captain Cold, the Mirror Master, Heat Wave, the Weather Wizard, the Trickster, the Pied Piper, the Top, and Captain Boomerang. The current incarnation of the Rogues includes Captain Cold, the Weather Wizard, Heat Wave, the third Mirror Master, and the second Trickster.

In chronological order (with issue and date of first appearance):