F
- Farfarmniflatch - Race of shapeshifters. Monstergirl of the Young Heroes is revealed to be one of them.
- Femazons - Race from Trigus VIII
- Fire People - Alien beings of living fiery plasma, who arrive on a comet, they are defeated by the Justice Society of America.
- Fluvians - The Fluvians of planet Fluvian are a form of aquatic plant-based life. Dob Zagil of Fluvian later became a Green Lantern.
- Fresishs - The Fresishs of Fresish are a race of insectoid humanoids. Gorgoth of Fresish is a member of the Dark Circle.
- Futuresmiths -
Read more about this topic: List Of Alien Races In DC Comics