Series starting with U
- Undescribable
- Undoing Yourself
- Undying Mercenaries
- Unearthly
- Unexpected
- Unexpected Brides
- Unexpected Prince Charming
- Unfettered
- Unfinished Business
- Unfinished Hero
- Unfinished Tales
- Unicom Applied Information Technology
- Unicorn
- Unicorn Diaries
- Unidentified Funny Objects
- Unincorporated Man
- Uninvited
- Union Square Cafe
- Unique
- United States Exploring Expedition
- United States of Apocalypse
- Uni the Unicorn
- UNIT: The New Series
- Unity
- Univers
- Universe of Fashion
- University Hospital
- University Press of Kentucky New Poetry & Prose Series
- University Square
- Universo Marvel
- Universo Reina Roja
- Unknown
- Unknown Armies
- Unleashed
- Un Long Destin de sang
- Unlucky 13
- Unlucky Young Men
- Un món màgic per descobrir
- Unnerving Magazine
- Unofficial Guides
- Unprofessional Bad Boys
- Unraveling
- Unreal!
- Unreal Magazine
- Un roman de Noël victorien
- Un Sac de Billes
- Unsolved Mysteries from History
- Unsplatterpunk!
- Unstoppable!
- Untamed
- Until Him/Her
- Until The Dawn
- Until Tuesday
- Untimely Meditations
- Untold Legends
- Unwind Dystology
- Up Close
- Upgrading and Repairing
- Upgrading and Repairing PCs
- Uphill Walkers: Portrait of a Family
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