Series starting with U
- UCLA Symposia on Molecular & Cellular Biology: New Series
- UFiles
- UFO
- Uglies
- Uki
- Ukiah Oregon
- UK Nature Conservation Series
- Ultimate
- Ultimate Adventures
- Ultimate Black Panther (2024)
- Ultimate Drum Play-Along
- Ultimate Fantastic Four (2003) (Single Issues)
- Ultimate Galactus Trilogy
- Ultimate Iron Man
- Ultimate Marvel Team-Up (Collected Editions)
- Ultimate Six
- Ultimate Spider-Man
- Ultimate Spider-Man (2000) (Collected Editions)
- Ultimate Spider-Man (2000) (Single Issues)
- Ultimate Spider-Man Collection (RCS Quotidiani)
- Ultimate Unofficial Guide
- Ultimate War
- Ultimate X-Men
- Ultimate X-Men (2001) (Collected Editions)
- Ultimate X-Men (2001) (Collected Editions) (Brian K. Vaughan)
- Ultimate X-Men (2001) (Collected Editions) (Robert Kirkman)
- Ultimate X-Men (2001) (Single Issues)
- Ultimate X-Men (2001) (Single Issues) (Brian K. Vaughan)
- Ultimate X-Men (2001) (Single Issues) (Brian Michael Bendis)
- Ultimate X-Men (Coleccionable Ultimate)
- Ultimate X-Men - El Universo Definitivo
- Ultimate X-Men (Italian edition)
- Ultimate X-Men (Italian edition) (Aron Coleite)
- Ultimate X-Men (Italian edition) (Brian K. Vaughan)
- Ultimate X-Men (Italian edition) (Brian Michael Bendis)
- Ultimate X-Men (Italian edition) (Robert Kirkman)
- Ultimativna kolekcija Marvel grafičkih novela
- Ultimativna kolekcija Marvel grafičkih novela (Brian Michael Bendis)
- Ultimativna kolekcija Marvel grafičkih novela (Frank Miller)
- Ultimativna kolekcija Marvel grafičkih novela (Grant Morrison)
- Ultimativna kolekcija Marvel grafičkih novela (Mark Millar)
- Ultimatum (Collected Editions)
- Ultramarines
- Ulysse Moore
- Ulysses Moore
- Un...
- Unabridged Audiobook) (J.P. Beaumont Detective Series
- Una chica N.O.R.M.A.L.
- Unapologetic
- Una Vida Con Proposito
- Uncanny Inhumans
- Uncanny Magazine
- Uncanny X-Force (2010)
- Uncanny X-Men
- Uncanny X-Men (1963)
- Uncanny X-Men (1963) (Arnold Drake)
- Uncanny X-Men (1963) (Don Heck)
- Uncanny X-Men (1963) (Gary Friedrich)
- Uncanny X-Men (1963) (Stan Lee)
- Uncanny X-Men (2013)
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