Kate O'Hearn is a Canadian children's fantasy writer, best known for her Pegasus, Titans, and Valkyrie series. O'Hearn published her first book, Shadow of the Dragon: Kira, in 2008, which led to a series of books.

Kate O'Hearn was born in Toronto, Canada, but raised in the heart of New York City and has lived in many places throughout her life. These days, she calls the south coast of England home. She has three brothers, no sisters, and is passionate about animals and their causes. Over the course of her life, she has had several careers before finding her real love, writing children's books. Being the only girl in a family of boys, she grew up a true tomboy and always loved books with high adventure. However, she discovered a lack of female leads in these adventure books. When she started to write, Kate decided to address this imbalance and now writes high fantasy adventures with strong, compassionate characters.