Series starting with U
- UCLA Symposia on Molecular & Cellular Biology: New Series
- UFO
- Uglies
- Uki
- Ukiah Oregon
- UK Nature Conservation Series
- Ultimate
- Ultimate Adventures
- Ultimate Black Panther (2024)
- Ultimate Drum Play-Along
- Ultimate Galactus Trilogy
- Ultimate Iron Man
- Ultimate Marvel Team-Up (Collected Editions)
- Ultimate Spider-Man
- Ultimate Spider-Man (2000) (Collected Editions)
- Ultimate Spider-Man (2000) (Single Issues)
- Ultimate Unofficial Guide
- Ultimate X-Men
- Ultimate X-Men (2001) (Collected Editions)
- Ultimate X-Men (2001) (Single Issues)
- Ultimate X-Men (Coleccionable Ultimate)
- Ultramarines
- Ulysse Moore
- Ulysses Moore
- Una chica N.O.R.M.A.L.
- Una Vida Con Proposito
- Uncanny Inhumans
- Uncanny Magazine
- Uncanny X-Force (2010)
- Uncanny X-Men (1963)
- Uncanny X-Men (2013)
- UnCivil Wars
- Uncle Abner
- Uncle John's Bathroom Reader
- Uncle Remus
- Uncle Scrooge
- Uncle Tom's Cabin
- Uncle Wiggily
- Uncollected
- Uncollected Anthology
- UnCommon Anthologies
- Undead Worlds
- Undercover Dish Mystery
- Underdog Anthology
- Understanding Options
- Understanding People in the Past
- Understanding the American Promise
- Understanding the Times
- Understanding Trump
- Under Suspicion
- Under the Mistletoe
- Under The Mistletoe Collection
- Under the Mountain
- Under the Never Sky
- Under The Oak Tree - Novel
- Under the Oak Tree (The Comic)
- Under the Tuscan Sun
- Undertow
- UnderVerse
- Underworld USA
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