- Undad - Volume Three
- Undead
- Undead Advantage, A Zombie Chronicles Novel
- Undead Ahead: Zombies
- Undead Encounters
- Undead Flesh
- Undead Freaks
- Undead Genesis: Zombie
- Undead Island (Escape - Vol. 3)
- Undead Island (High Tide - Vol. 1)
- Undead Island (The Lighthouse - Vol. 2)
- Undead Island: The Complete Collection
- Undead L.A. 1: LAX
- Undead L.A., Volume One
- Undead L.A., Volume Two
- Undead Vengeance
- Undead Weapons
- Undead Worlds
- Undead Worlds 2
- Undead Worlds 3
- Undead: Vampire Rising (Lust for Blood)
- Under
- Under a Freezing Moon
- Under a Raven's Wing
- Under a White Hot Moon: Howl of the Weredingo
- Under Contract
- Under Siege: A Post-Apocalyptic Zombie Thriller
- Under the Bed
- Under The Darkness
- Under the Devil's Wing
- Under the Pyramids
- Under the Pyramids (Fantasy and Horror Classics)
- Under the Slaughterhouse
- Under the Sunset
- Under Worlds, After Lives
- Underbridge
- Undercarriage V.1
- Undercover Best Friend: A Tale of Age Regression
- Underground
- Undergrowth
- Underland
- Underland Arcana 1
- Underland Arcana 2
- Underland Arcana 3
- Underland Arcana 4
- Undermeat
- Undertaker's Moon
- Undying Love
- Une bestiale comédie
- Une Lueur Au Cœur Des Ténèbres
- Une Momie qui ressuscite
- Une vie gâchée
- Unearthed
- Unearthly
- Unearthly Fables
- Uneasy Reading: 4 Horror Shorts
- Uneasy Tales
- Unexpected Strangers
- Unfair Play
- Unfamiliar Country
- Unfinished Business
- Unfinished Rituals
- Unfinished Stories in a Seaside Town and Other Weird Tales
- Unfit For Burial: Four Short Stories
- Unfleshed
- Unforeseen Circumstances (A Short Story)
- Unfleshed
- Unforeseen Circumstances (A Short Story)
- Unforgivable
- Unforgiven: A Tale of the Possessed
- Unfortunate Elements of My Anatomy
- Ungavir
- Unhallowed Ground
- Unhappy Endings: A Collection of Short Stories
- Unhappy Far-Off Things
- Unhealthy Screams
- Unhinged
- Unhinged: Tales of Darkness and Terror
- Unholy
- Unholy Crusade
- Unholy Fire
- Unholy Ground
- Unidentified
- Uninvited Darkness
- Unit 11
- Unit 12A-05
- United Earth
- UniteDead Kingdom
- UniteDead Kingdom 2
- Universal Harvester
- Universal Legacy - Tome 1
- University
- Unknown Quantities: Eleven Tales of the Slightly Weird
- Unknown Sender: A Horror Short Story
- Unleashed
- UNLOVELY
- Unlucky Roger
- Unlucky Terror