- Deep Space Dragnet
- Deep Space Dreaming
- Deep Space Flight
- Deep Space Intelligence : Bad Man
- Deep Space Intelligence : Home
- Deep Space Intelligence : Invisible
- Deep Space Intelligence : Masters Return
- Deep Space Intelligence: Ghosts of Nyzon 5
- Deep Space Interface
- Deep Space Ocean
- Deep Space Rescue 911
- Deep Star and Hidden Terror
- Deep State
- Deep State: A Nathaniel Cade Story
- Deep Storm
- Deep Water
- Deep Water and Other Stories
- Deep Waters: A Strange Story
- Deep Web
- Deep Web - Libro 5
- Deep Web Dweller
- Deep Within The Shadows (Superstition Series)
- Deep World Blood
- Deep Wounds: Book 11 of the Heku Series
- Deeper
- Deeper than the Deep Blue Sea
- Deeping Dreams
- Deeply
- Deeply Disturbed Donuts
- Deeply Odd
- Deepsix
- Deepwater King
- Deepwater's Daughter
- Deer Haven
- Deer Hearts Bear
- Deerfield Unvisited
- Deerskin
- DEF: Wrath of the Gods - Revelations
- DEF: Wrath of the Gods - The Journey to the Black Mountains
- Default - L'ultima apocalisse
- Defeat The Aliens
- Defeated Victory
- Defeating the Demon Lord's a Cinch (If You've Got a Ringer), Vol. 1
- Defeating the Demon Lord's a Cinch (If You've Got a Ringer), Vol. 2
- Defeating the Demon Lord's a Cinch (If You've Got a Ringer), Vol. 3
- Defeating the Demon Lord's a Cinch (If You've Got a Ringer), Vol. 4
- Defeating the Storm
- Defect
- Defective
- Defekt
- Defender of Genes
- Defender of Gilgin
- Defender of Histories
- Defender of the Crown
- Defender of the Departed
- Defender of the Flame
- Defenders of Mankind Omnibus
- Defenders of Medieval Wales: Cold My Heart/The Last Pendragon/Daughter of Time
- Defenders of Nightstar
- Defenders of the Rim: Beginnings
- Defenders of the Underworld
- Defenders of the Valley
- Defenders of the Wildings: The Complete Series
- Defenders of Ulthuan
- Defenders of Valinthia
- Defending Freedom
- Defending Heaven
- Defending Her Vikings
- Defending Hope
- Defending Lizzie
- Defending the Castle
- Defending the Galaxy
- Defending Zando
- Defense Mech
- Defense Mechanisms
- Defiance (Stories of Singularity 6)
- Defiant
- Defiant Guardians
- Defiant Hearts
- Defiant Light
- Defiant Revival
- Defiant, She Advanced
- Defiled
- Defiled World
- Defilement
- Defiler of Tombs (Kormak Book Two)
- Define Love, or: Pick a Lane, A*****e!
- Defined but not Embedded
- Defining Criminality: A Drake Science Fiction Private Eye Short Story
- Defining Me
- Definitely Deadly
- Definitive Collisions Of Fire And Ice
- Deflecting Fate
- Defrost
- Defy & Defend
- Defy or Defend: A Delightfully Deadly Novel
- Defy The Dead
- Defy the Heaven, Slay the Gods
- Defy The Sky
- Defying Doomsday
- Defying Fate (The Descent Series, #6)
- Defying Heaven In Another World
- Defying Instinct
- Defying Mars
- Defying The Empire
- Degare' (Briarcliff Series, Book 3)
- Degenerated
- Degeneration (Degeneration Book 1)
- Degeneration: A Post-Apocalyptic Novella
- Degranon: A Science Fiction Adventure
- Degrees of Delusion