Flash villains listed by the era in which they first appeared. This is not a complete list. So far it only lists villains I have profiled on this site, plus a few others I have added as I thought of them.
Golden Age
- Dmane (one-shot)
- The Eel
- The Fiddler
- The Icicle (in Green Lantern)
- The Rag Doll
- The Rival
- The Shade
- Star Sapphire
- The Thinker
- The Thorn
- The Threat (one-shot)
- The Turtle
- Vandal Savage (in Green Lantern)
Silver Age
- Rogues Gallery
- Abra Kadabra
- Captain Boomerang I
- Captain Cold*
- Dr. Alchemy*
- Mr. Element I*
- Goldface (in Green Lantern)
- Gorilla Grodd*
- Heat Wave
- Mazdan*
- Mirror Master I*
- Pied Piper*
- (Dr.) Polaris (in Green Lantern)
- T.O. Morrow
- The Top
- Trickster I
- Turtle Man*
- Weather Wizard*
- Professor Zoom
* Introduced in Showcase or the first year of The Flash.
Bronze Age
- The Clown
- Colonel Computron
- Eradicator
- Golden Glider
- Kobra (in Kobra)
- Lord of Limbo
- Master Villain
- Molder
- Ross Malverk (one-shot)
- Rainbow Raider
- Ringmaster
- Samuroids (samurai androids)
- Viper (one-shot)
- Clive Yorkin
Post-Crisis: Baron & Messner-Loebs
- Blue Trinity
- Celestial Enlightenment Ranch
- Christina
- Chunk
- The Comforter
- Kilg%re
- The Last Resort
- Mota (in The Flash 50th Anniversary Special)
- Proletariat
- Pyranis
- Sloe, Steddy, and Sprynt (Turtle’s henchmen)
- Speed Demon
- Velocity 9
Post-Crisis: Waid/Augustyn & Millar/Morrison
- The Alchemist
- Black Flash
- Chillblaine
- Cobalt Blue
- Cobalt Blue Legacy
- The Combine
- Dark Matter (in Legends of the DC Universe)
- Diogenes
- The Folded Man
- Inertia (in Impulse)
- Magenta (as a villain, here and in New Titans)
- Mirror Master II (in Animal Man)
- Mr. Frost
- Neron (in Underworld Unleashed)
- Paradox
- Razer
- Replicant
- Savitar
- The Suit
- Team Turmoil
- President Thawne
- White Lightning (in Impulse)
Post-Crisis: Johns
- New Rogues*
- Blacksmith*
- Brother Grimm
- Captain Boomerang II (in Identity Crisis)
- Cicada
- Double Down*
- Mr. Element II
- Fallout*
- Girder*
- Murmur*
- The Network
- Peek-a-Boo
- Plunder
- Rainbow Raiders
- Tar Pit
- Trickster II
- Zoom II
* Introduced in The Flash: Iron Heights.
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