- Unknown Reality
- UNLAWFUL RESTRAINT
- Unleashing A Warrior
- Unlikely Prophet
- Unlimited Class
- Unlocked Stories
- Unlucky Dip
- Unmasked Alloy (Sub-Normal, #2)
- Unmoored
- Unnatural
- Unnatural Things
- Unnatural Time (Infinity, Ltd. #1)
- Uno nessuno centomila
- Uno Splendido Futuro
- Unorthodox
- Unoworld Stories Book 1
- Unraveling (After The End #1)
- Unravelling
- Unreachable Skies
- Unregistered
- Unremarkable & Other Stories
- Unseen Servant
- UNSETIC Files: The Measure of Dreams
- Unsettling Times
- Unspoken Stories
- Unstable Prototypes
- Unstuck
- Unsung Heroes
- Unter dem Banner des weißen Hirsches
- Unter dem Mondstern
- Unter der Sonne
- Unter der Sonne - Teil 1: Erwachen
- Unter der Sonne - Teil 2: Aufbruch
- Unter der Sonne - Teil 3: Horizont
- Unter fremden Sternen - Die Frontier-Saga (2)
- Unternehmen Tiefsee
- Untethered
- Untied Shoelaces of the Mind 2011 Anthology
- Until All the Stars Are Found
- Until the End
- Until the End of Days
- Until the Last of Me
- Until the Stars Grow Cold
- Untimely
- Clive Cussler’s Dark Vector
- Light Bringer
- Unto the Breach
- Unturned Stones
- Unusual 1st Contact Stories
- Unusual Happenings: Tales of Death, Dreams and Dimensions
- Unwashed Fiction
- Unwise Child
- Unworthy Heroes
- Uomini della Morte
- Uomini troppo veri
- Up in the Air
- Up In the Air: An Adult Fantasy
- Up the Line
- Up The Walls of the World
- Up to the Sky in Ships
- Upadek
- Upadła Świątynia
- Upbeats
- Upbeats 2: Crime After Crime
- Updown
- Upgrade
- Upgrade: A Metamorphosis of Prime Intellect Short Story
- Upgraded
- Upgrades
- Upheaval
- Uplift
- Uploaded
- Upon A Far Distant Shore
- Upon A Midnight Clear
- Upon Another Edge Broken
- Uppity Aliens
- Upright Women Wanted
- Uprising
- Uprising 2050
- Uprooted
- Uprising 2050
- Uprooted
- Upside: Book 1 - The Early Years
- Upsurge
- Uraami
- Urana’S Seven Daughters
- Uranie
- Uranus
- Urban Horror Volume 2: Four More Short Horror Stories
- Urban Horror: Doors Short Story by Richard GK Stark
- Urban Nightmares: Tales of Horror and Wonder
- Urchin House Blues
- Ure Infectus: The Chimera Adjustment: Book One (Imperium Cicernus 1)
- Urknod Army: The Soldier's Manual
- Urland
- Uroboros
- Ursa Minor
- Us
- Users of the Mind
- Usha
- Usher Syndrome
- Usher's Harbour
- Usu
- Usurper of the Sun
- UT-1
- UT-2
- Utopia
- Utopia Betrayed
- Utopia Gone
- Utopia mit kleinen Fehlern
- Utopia morbida
- Utopia With AI
- UTOPIA, Come nacque il Nuovo Mondo
- Utopian Estates
- Utopian Massacre
- Utopian Reality
- Utopic Paradigm
- Uzan 2 Mikayla
- Uzan 3 Tom