• The New York Public Library Books for Kids
• The Nocturnals
• The Obernewtyn Chronicles
• The Octonauts
• The Official 11+ Practice Papers
• The Originals
• The Other Countess
• The P. K. Pinkerton Mysteries
• The Peculiar
• The Penderwicks
• The Pippin Teacher's Library
• The Poetry Bookshelf
• The Politics of Northern India
• The Puppy Place
• The Roman Mysteries
• The Rules
• The Saga of Darren Shan
• The Saga of Larten Crepsley
• The Secret Series
• The Secrets Club
• The Secrets of the Immortal Nicholas Flamel
• The Shamer Chronicles
• The Sisters Eight
• The Smek Smeries
• The Solar System
• The Specialists
• The Spiderwick Chronicles
• The Squad
• The Squire's Tales
• The Storm's Quarry Series
• The Subnuclear Series
• The Tapper Twins
• The Theodosia Series
• The Thickety
• The Thinking Lab: Science
• The Toddler Series
• The Tomorrow Series
• The Top-Secret Diary of Celie Valentine
• The Trials of Apollo
• The True Trilogy
• The Twilight Saga
• The Underland Chronicles
• The Unexplained
• The University of Western Ontario Series in Philosophy of Science
• The Unknown Assassin
• The Vampire Diaries
• The Veil Trilogy
• The Very Fairy Princess
• The Very Hungry Caterpillar
• The Wadsworth & Brooks/Cole Mathematics Series