House of Night is a series of young adult vampire-themed fantasy novels by American author P. C. Cast and her daughter Kristin Cast. It follows the adventures of Zoey Redbird, a sixteen-year-old girl who has just become a "fledgling vampyre" and is required to attend the House of Night boarding school in Tulsa, Oklahoma. Books in the series have been on the New York Times Best Seller list for 63 weeks and have sold over seven million copies in North America, and more than ten million books worldwide, in 39 countries. The series, published by St Martin's Press, is planned to include twelve books.
Instead of vampire, the authors use the variant spelling vampyre throughout the book series. This convention is also applied to the words vampyric and vampyrism.