Series starting with U
- 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 Marine
- Undead Worlds
- Undercover Dish Mystery
- Underdog Anthology
- Underlined Paperbacks
- Understanding Options
- Understanding People in the Past
- Understanding the American Promise
- Understanding the Times
- Understanding Trump
- Under Suspicion
- 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
- Underwater Investigation Unit
- Underworld Gods
- Underworld USA
- Undescribable
- Undoing Yourself
- Undying Mercenaries
- Unearthly Delights
- Unexpected
- Unexpected Bride
- Unexpected Brides
- Unexpected Prince Charming
- Unfailing Love
- Unfamiliar
- Unfettered
- Unfinished Business
- Unfinished Hero
- Unfinished Hero (Kristen Ashley)
- Unfinished Tales
- Unicom Applied Information Technology
- Unicorn
- Unicorn Diaries
- UniCorp
- Unidad de Casos Perdidos
- Unidentified Funny Objects
- Unincorporated Man
- Uninvited
- Uninvited Series
- Union Square Cafe
- Unique
- United States Exploring Expedition
- United States of Apocalypse
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