Kate Forsyth (born 1966) is an Australian author. She is best known for her historical novel Bitter Greens, which interweaves a retelling of the Rapunzel fairy tale with the true life story of the woman who first told the tale, the 17th century French writer Charlotte-Rose de Caumont de La Force.
Forsyth is also the author of several children's books, including The Gypsy Crown, The Puzzle Ring The Starthorn Tree, The Wildkin's Curse, The Starkin Crown and Dragon Gold. She has also published two heroic fantasy series, The Witches of Eileanan and Rhiannon's Ride, the poetry collection Radiance, and the novel Full Fathom Five under her maiden name, Kate Humphrey. She is a five-time Aurealis Award winner.