- Island of SecretsKim Jordan
- Island of the Lizard KingIan Livingstone
- Island of the UndeadKeith Martin
- Island of the Walking DeadAllen Sharp
- Islands of TerrorR.G. Austin
- Isle of IllusionMadeleine Simon
- It Came from the InternetR.L. Stine
- It Happened at Camp Pine TreeR.A. Montgomery
- It's Only a Nightmare!R.L. Stine
- Iwo JimaGary Smailes
- Jack London's Call of the WildRyan Jacobson
- JailbreakDavid Lowrie
- Jake Goes BananasMax Brallier
- James Armistead LafayetteKyandreia Jones
- James Bond in Barracuda RunSteven Otfinoski
- James Bond in Programmed for DangerJean M. Favors
- James Bond in Strike It DeadlyBarbara Siegel, Scott Siegel
- James Bond in Win, Place, or DieR.L. Stine
- Japan: How Do Hands Make Peace?Carolyn Meyer
- Jason's First QuestRoger E. Moore
- Jedi's HonorTroy Denning
- Jeremiah's PromiseKenneth Roseman
- Jewels in the DarkRusty Hallock
- Joe Weller Explores: Haunted HotelJoe Weller
- Journey to StonehengeFred Graver
- Journey to the Center of the AtomCarol Gaskin
- Journey to the Center of The EarthConnor Hoover
- Journey to the Year 3000Edward Packard
- Journey to Vernico 5H. William Stine, Megan Stine
- Journey Under the SeaR.A. Montgomery
- Judoon MonsoonOli Smith
- Jules Verne's 20,000 Leagues Under the SeaDeb Mercier
- Jungle AdventureNora Logan
- Jungle Book AdventureJim Razzi
- Jungle CrashSimon Chapman
- Jungle of the Killer AvocadosConnor Hoover
- Jungle SafariEdward Packard
- Jungle TrekChase Wilder
- Just This OnceDean Feldmeyer
- Justice League of AmericaRobert Loren Fleming
- Kaleidoscope FrenzyMark Lain
- Kathryn in the CityMary Anne Mohanraj
- Katie and the Missing KittenDaisy Meadows
- Keep Me in MindNancy Holder
- Keep of the Ancient KingMichael Gray
- KGB DoublecrossMatthew Costello
- Kharé - Cityport of TrapsSteve Jackson
- Kidnap in SpacePeter Milligan
- Kidnapped!Edward Packard
- Kidnapped!Larry Mike Garmon
- Killer CustardSteve Barlow, Steve Skidmore
- Killer VirusR.A. Montgomery
- Killing Hitler With Praise And FireMatthew Hutchins
- King ArthurSteve Barlow, Steve Skidmore
- King Cobra's CurseAlison Reynolds, Sean Willmore
- King Tut's AdventureConnor Hoover
- King's JudgementJoseph Daniels
- King's QuestTom McGowen
- Kingdom of HorrorJ.H. Brennan
- Kiss the ChefDana Aros