- In the Empire of Underpants and Other Stories
- In The Event Of A Real Emergency
- In the Eye of the Sphinx
- In the Forest (The Adventures of Archibald and Jockabeb)
- In the Garden of Iden
- In the Green Star's Glow
- In the Hall of the Mad-God
- In the Hall of the Martian King
- In the Hollow of the Deep-Sea Wave
- In the House of the Machine God
- In the Land of Nod
- In the Land of Time
- In The Meadow Of Night
- In the Mountains (The Adventures of Archibald and Jockabeb)
- In the News
- In the Orient (The Adventures of Archibald and Jockabeb)
- In the Outback (The Adventures of Archibald and Jockabeb)
- In the Palace of Shadow and Joy
- In the Pass
- In the Presence of Mine Enemies
- In the Quick
- In the Realm of the Wolf
- In the Ring
- In the Shadow of Extinction: A Kaiju Epic -- The Complete Omnibus (Parts 1-3)
- In the Shadow of London
- In the Shadow of Mountains: The Lost Girls
- In the Shadow of Mountains: The Return of the Sixpack
- In The Shadow Of The Hills
- In the Shadow: Book Two Sandes Chronicles
- In the Siberian Fields
- In the Stars I'll Find You
- In The Trees
- In the Triangle
- In the Wake of Chaos - Second Edition
- In the Wake of Technology
- In the Watchful City
- In the Wilderness
- In the Year 2889
- In the Year of Their Lord
- In the Zone
- In This Night We Own
- In Time for Prom
- In Two Minds
- In un altro paese
- In un mondo perfettamente felice
- In una piccola galassia ai confini dell'universo
- In Zeiten der Flut
- In2Minds
- In2Minds2
- Inanna
- Incarnation: Wandering Stars Volume One
- Inchoate: (Short Stories Volume I)
- Inciampo - Edizione arricchita
- Incident 7834, Jupiter
- Incident in Mona Passage
- Incident on a Small Colony
- Incident on Planet Mia-911...Space Grail
- Incoming! An Angry Robot 2019 Sampler
- Incompletely Human: a "Linked" novel
- Incompletos
- Incordié al piloto Jim
- Incorrigible: Secrets Past & Present - Part One / Entrapments (Staves of Warrant)
- Incorrigible: Secrets Past & Present - Part Three / Gathering (Staves of Warrant)
- Incorrigible: Secrets Past & Present - Part Two / Seeking (Staves of Warrant)
- Incredible Worlds - The Sci Fi Action Pack II (5 Full Length Novels)
- Increments
- Incursion
- Incursion: Taylor Neeran Chronicles #2
- Incuvus
- Indian Hill 1: Encounters ~ A Michael Talbot Adventure
- Indian Hill 4: From the Ashes ~ A Michael Talbot Adventure
- Indian Hill 5: Into the Fire:
- Indian Hill 6: Victory's Defeat
- Indigo
- Indigo - Dark Republic Book Two
- Indigo Billy
- Indigo Kids
- Indigo Mad
- Indirection
- Indistinguishable from Magic
- Indomitable Survivor
- Indra Station
- Indraprasth Machination of Kronos
- Inescapable ~ The Beginning
- Inescapable ~ Tomorrow
- Inevitable Uncertainty
- Infania
- Infected
- Infernal
- Infernal Devices
- Infernal Providence
- Inferno
- Inferno 2020
- Inferno Station
- Inferno: A Chronicle of a Distant Planet
- Infestation (Zombies Are Human, Book Two)
- Infestation On The StarSmasher
- Infiltration
- Infinite Dendrogram: Volume 10
- Infinite Dendrogram: Volume 11
- Infinite Dendrogram: Volume 12
- Infinite Dendrogram: Volume 13
- Infinite Dendrogram: Volume 14
- Infinite Dendrogram: Volume 15
- Infinite Dendrogram: Volume 16
- Infinite Dendrogram: Volume 2
- Infinite Dimensions
- Infinite Dreams
- Infinite Genesis Book 2: Growth
- Infinite Justice
- Infinite People
- Infinite Reef
- Infinite Sight
- Infinite Space - Choose Your Story
- Infinite Stratos: Volume 1
- Infinite Stratos: Volume 10
- Infinite Stratos: Volume 11
- Infinite Stratos: Volume 12
- Infinite Stratos: Volume 2
- Infinite Stratos: Volume 3
- Infinite Stratos: Volume 4
- Infinite Stratos: Volume 5
- Infinite Stratos: Volume 6
- Infinite Stratos: Volume 7
- Infinite Stratos: Volume 8
- Infinite Stratos: Volume 9
- Infinitum
- Infinity 48
- Infinity Engine
- Infinity's Gateway
- Infinity: A Bridger's Origin
- Influenze aliene
- Informagie
- Matrice Cyberpunk
- Ingeniuman - Tome 1
- Ingeniuman - Tome 2
- Inherit the Stars
- Inheritance of Woe
- Inheritance: The Martiniere Legacy Book One
- Inheritance: Who Do You Think You Are?
- Inhumaine Contrebande
- Inhuman
- INI
- Ini (Sci-Fi-Klassiker)
- Initial Profit
- Initiation
- Injection Burn
- Ink
- INK Trilogy: Red, Black & Blue
- Inmitten der Unendlichkeit