Kate Griffin is a pseudonym used by the British author Catherine Webb. She is known for her work in the fantasy genre, particularly for her series set in the urban fantasy world of London. Her writing often features elements of magic, adventure, and complex characters, appealing to both young adult and adult readers. Under the name Kate Griffin, she has published several novels, including the popular Matthew Swift series. Griffin's storytelling is characterized by rich world-building and a unique blend of humor and darkness, making her a notable figure in contemporary fantasy literature.