Stormbreaker is a young adult action-adventure book written by British author Anthony Horowitz, and is the first novel in the Alex Rider series. The book was released in the United Kingdom on 4 September 2000, and in United States release on 21 May 2001, where it became a New York Times Bestseller. Since its release, the book has sold more than nine million copies worldwide, been listed on the BBC's The Big Read, and in 2005 received a California Young Reader Medal.

Anthony John Horowitz is an English novelist and screenwriter specialising in mystery and suspense. His works for children and young adult readers include the Alex Rider series featuring a 14-year-old British boy who spies for MI6, The Power of Five series, and The Diamond Brothers series.