Kate Forsyth is an acclaimed Australian author born on 3 June 1966. She is best known for her historical novel Bitter Greens, which cleverly interweaves a retelling of the Rapunzel fairy tale with the true-life story of Charlotte-Rose de Caumont de La Force, the 17th-century French writer who first told the tale.

Forsyth has also written 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 published two heroic fantasy series: The Witches of Eileanan and Rhiannon's Ride, and has also released the poetry collection Radiance and the novel Full Fathom Five under her maiden name, Kate Humphrey.

Forsyth is a five-time Aurealis Award winner. She is married with three children and resides in Sydney, New South Wales. She is a direct descendant of Charlotte Barton, the author of Australia's earliest known children's book. Her older sister, Belinda Murrell, is also an author for children and young adults, and their younger brother, Nick Humphrey, is a nonfiction author.

Kate wrote her first novel at the age of seven and is now the internationally bestselling author of 40 books for both adults and children. Her books for adults include Beauty in Thorns, The Beast's Garden, The Wild Girl, and the bestselling fantasy series Witches of Eileanan.