- A, B, C: Three Short Novels
- A.I. APOCALYPSE
- A.I. Confidential (Liquid Cool, Book 6)
- A.l.i.n.a.
- A.N.G.E. 03 : Perfidia
- A.N.G.E. 04 : Sicarius
- A.N.G.E. 05 : Codex Angelicus
- A.N.G.E. 06 : Tribulare
- A.N.G.E. 07 : Absinthium
- A.N.G.E. 08 : Periculum
- A.N.G.E. 09 : Cenotaphium
- A.N.G.E. 10 : Obscuritas
- A.o. 13.0.0.0.0 - Bloodlines
- A.O.F. The Age Of Evolution - La Setta dei Titani
- A.R.M.O.U.R.
- A.S.H.O.S. Eleven: Day One (Final Colony 0.5)
- Aaden Bluestar Awakening
- Aamu
- Aarn Becomes A Man
- Aaron: The Fall of America
- Abaddons Tor
- Abajam Chronicles
- Abandon Hope
- Abandonati
- Abandoned
- Abandoned on Juracan
- Abandoned Ships, Hijacked Minds
- Abandoned Time Travel
- Abandonment of Stars
- Abba Nila'ni
- Abbreviated Epics
- Abcalia, El Viaje de los Sueños
- Abducted
- Abducted by the Alien
- Abducted to War
- Abducting the Princess
- Abduction Revelation Ii
- Abduction!
- Abduction: The Doors of the Ancients, Book 2
- Abenteuer Science Fiction: Das Festival von Tasner
- Abenteuer um Lirandil und die Orks von Athranor - Der Wanderer der Elben
- Abigail, A Valaran Chronicles Short Story
- Abney Park's The Wrath Of Fate
- Abort! Abort! Voyage to Save the Mind
- Above a Distant Sky Seen
- Above the Ether
- Above The Huron Sea
- Above the Timberline
- Abraham Merritt Premium Collection: 18 Sci-Fi Books in One Edition
- Abraxis Code
- Absalom
- Absence of Blade
- Absolute Mayhem
- Absolution Gap
- Abstraction
- Abysm (Aurora Renegades Book Three)
- Abyss
- Acacia Crescent
- Academentia
- Acadia Event
- Acceptance
- Accepting the Lance
- Acciaio
- Accidental Bounty
- Accidental Death
- Accidental Prophet
- Accidental Thoughts
- Accord of Shadows
- Accounting for Evil
- Ace Carroway and the Great War
- Ace Carroway and the Growling Death
- Ace Carroway and the Handsome Devil
- Ace Carroway and the Midnight Scream
- Ace Carroway Around the World
- Ace in the Hole
- Ace of Swords: Stories from Archanea
- Aces Abroad
- Aces High
- Achaja Tom 3
- Acid World of the Dragon
- Ack-Ack Macaque
- Ack-Ack Macaque: The Complete Trilogy
- Across the Ages
- Across The Continuum Sea
- Across the Floors of Silent Seas
- Across the Great Rift
- Across the Plains of Angar
- Across the Stars: Book Three of Seeds of a Fallen Empire
- Across the Stonewind Sky
- Across the Zodiac
- Across The Zodiac
- Across the Zodiac (Sci-Fi Classic)
- Act of God
- Act of Passion
- Activate
- Acts of Contrition
- Acts of Todd
- Acts of War
- Ad Astra
- Ada's Adventures in Science
- Adam Event
- Adam Exiled
- Adam Exitus
- Adam Nexus
- Adam Powerhouse: Birth of the Double Zero (Episodes 1 to 9)
- Adam's Apple and the Infinite Regress
- Adam's Point: Book III Legacy Series
- Adamonde
- Adams and Eves
- Adanya Tebbet-Theus and the Dark Mask
- Adapt or Die
- Adaptation
- Adaptation: Part 6
- Adaptively Radiant
- Adattamento
- Adel verpflichtet - Der Agent der Krone
- Adele and the Makers
- Adini's Quest, Book Two: Finding Savini
- Adjudication (Metatron's Army, Book 13)
- Admiral
- Adonis the Sex-Bot
- Adrift (Starship Perilous Adventure #5)
- Adrift On The River Of Time and other stories
- Adrift: In Search of Memory
- Advance on Sequetus 3
- Advanced Chemistry
- Advantage (Metatron's Army, Book 1)
- Advenae
- Advent
- Advent Skies
- Adventure Capital
- Adventure In the Fifth Dimension
- Adventure of Heroes
- Adventurer
- Adventurer (Star Minds Lone Wolves)
- Adventures in the Moon and Other Worlds
- Adventures in Time
- Adventures Into the Unknown
- Adventures of a Time Traveler
- Adventures of Commander Richard Gazebo
- Adventures of Erdalto the Magnificent
- Adventures of George Thurman
- Adventures of Huckleberry Finn
- Adventures of Huckleberry Finn (Illustrated)
- Adventures of Huckleberry Finn Robotic Edition
- Adventures of Mazaru, the Space Monkey Pirate
- Adventures of Obsession: The Beginning, Pirate to Patriot
- Adventures of Professor Perimeter The Hataki War Part I
- Adventures of Prove Your Marriage Island
- Adventures of Space Cadets 101: Back At It On Two Fronts