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- Joseph Jacobs (1854–1916) - English Fairy Tales, Celtic Fairy Tales, European Folk and Fairy Tales
- Grace James - The John and Mary series, Green Willow and Other Japanese Fairy Tales
- James Janeway (1636–1674) - A Token For Children
- Brian Jacques - The Redwall series, Castaways of the Flying Dutchman
- Éva Janikovszky (1926–2003) – If I Were a Grown-Up, Who Does This Kid Take After?
- Tove Jansson (1914–2001) - The Moomin books
- Paul Jennings - Unreal!, Undone!, Unbelievable!, The Paw Thing, The Gizmo, Wicked series
- W. E. Johns (1893–1968) - The Biggles series
- Marcia Thornton Jones - The Adventures of the Bailey School Kids, Ghostville Elementary series
- Diana Wynne Jones (born 1934) - The Chrestomanci series, Howl's Moving Castle, Dogsbody
- Jacqueline Jules (born 1956) - over 20 books, including the Zapato Power series and Unite or Die: How Thirteen States Became a Nation
- Norton Juster - The Phantom Tollbooth, The Hello, Goodbye Window
- May Justus (1898–1989) - Gabby Gaffer, Luck for Little Lihu, New Boy in School
Read more about this topic: List Of Children's Literature Authors