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- Benedict Jacka, author of the Alex Verus series
- Steve Jackson, (co)author of many Fighting Fantasy books
- Brian Jacques, (1939-2011) author of the Redwall series
- L. Dean James, (born 1947)
- Tove Jansson, (1914–2001) author of the Moomin novels
- K. V. Johansen, (born 1968)
- Diana Wynne Jones, (1934-2011) author of the Chrestomanci series and Howl's Moving Castle
- Ivan Jones, author of The Ghost Hunter series
- J. V. Jones
- Robert Jordan (pseudonym of James Oliver Rigney, Jr.), (1948–2007) author of The Wheel of Time series
- Carrie Jones author " Need" series and After Obsession
Read more about this topic: List Of Fantasy Authors