Series beginning with I
- I Am Number Four: The Lost Files (E Books)
- I Funny
- I Hero
- I Hero - Atlantis Quest
- I Hero - Blood Crown Quest
- I Hero - Immortals
- I Hero - Legends
- I Hero - Megahero
- I Hero - Toons
- I Hero - Tyranno Quest
- I Hero: Monster Hunter
- I Spy
- Icemark Chronicles
- If I Stay
- Iggy and Me
- Iguana Boy
- Illmoor Chronicles
- Illuminae
- Imaginary Veterinary
- Immortal Beloved
- Immortals
- Immortals Quartet
- Imperial Trilogy
- Impossible Creatures
- Imposters
- Incarceron
- Incorrigible Children of Ashton Place
- Incredible Dadventures
- Incredible Worlds of Wally McDoogle
- Indian in the Cupboard
- Indiana Bones
- Indie Kidd
- Indigo Wilde
- Infamous Ratsos
- Infernal Devices
- Infinity Cycle
- Infinity Drake
- Infinity Ring
- Ingo
- Inheritance
- Ink Trilogy
- Inkheart
- Inness Legacy
- Inside Out
- Insignia
- Inspector Flytrap
- Intasimi Warriors
- Interdimensional Explorers
- Internet Detectives
- Inuk Quartet
- Inventors
- InvestiGators
- Invisible Detective
- Invisible Fiends
- Invisible Friend
- Iremonger Trilogy
- Iron Fey
- Iron Fey: Evenfall
- Iron Witch
- Isadora Moon
- Isis Trilogy
- Island
- Island of Thieves
- Islanders
- Isles of Storm and Sorrow
- It Girl
- Itch
- Ivy and Bean
- Ivy Newt
- Ivy Pocket
- Izzy the Inventor