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U[]
- U.N.I.O.N.
- U'nola
- Uatu the Guardian (Amalgam Comics)
- U-Ban
- Ubermensch (I)
- Ubermensch (II)
- Ubu (I)
- Ugly Ben Studly
- Uhlan
- Uli Algor
- Ulnoor, Meta (also known as Esper Lass)
- Ultimon (also known as Dai Yokohama)
- Ultimon Alpha
- Ultivac
Ultra Boy[]
- Ultra Boy (also known as Jo Nah)
- Ultra Metallo (Amalgam Comics)
- Ultra the Multi-Alien
- Ultraa
Ultra-Humanite[]
- Ultraman (Crime Syndicate of Amerika)
- Ultra-Man (I) & (II)
- Ultra-Sphinx
- Ulu Vakk (also known as Color Kid)
- Ulysses Bronson
- Ulysses Hazard (also known as Gravedigger)
- Ulysses Niel Grant
- Ulysses Steve Trevor
- Űman von Mauler
- Umbaluru
- Umbra
- Umbra (rebooted Shadow Lass)
- Umitu
- Una (also known as Luornu Durgo, Triplicate Girl, Duo Damsel and Triad)
- Unbearably Tall Man
- Uncle Barney
- Uncle Dan
- Uncle Harry
- Uncle Joel
Uncle Marvel[]
- Uncle Marvel (also known as Dudley H. Dudley) (Fawcett Comics)
Uncle Sam[]
- Uncle Zep
- Underlord Scetchtale (Vertigo)
- Undertow (also known as Ray Bailey) (WildStorm)
- Underwood, Mike (also known as Michael Underwood)
- Underworld Poet
- Undine (20th Century-Fox Television)
- Uni-Friend
- Unimaginable
- Union (also known as Ohmen) (WildStorm)
- Unit-12
- United Nations Ambassador
- Unity Kinkaid
- Universo (also known as Vidar)
- Unknown
- Unknown Boy (also known as Supergirl, Linda Lee Danvers and Kara Zor-El)
- Unknown Lantern
- Unknown Soldier
- Ur (also known as Mutant Master)
- Ur the Cave Boy
- Uranium (I)
- Uranium (II)
- Uranus
- Urgav
- Uriel (Vertigo)
- Urk
- Urko the Terrible
- Ursa
- Ursala (Vertigo)
- Urthlo
- USA
- Usil
- Uther Pendragon (Vertigo)
- Uxas (also known as Darkseid)