Anthony Horowitz (born April 5, 1955) is a British author and television scriptwriter. His most successful work has included creating and writing the series Foyle's War for ITV and writing several episodes of another ITV series, Midsomer Murders. Both of these are detective murder mystery series.

He began writing for television in the 1980s, contributing to Granada Television's anthology series Dramarama, and also writing for the popular fantasy series Robin of Sherwood. His association with murder mysteries began with the adaptation of several Hercule Poirot stories for ITV's popular Agatha Christie's Poirot series during the 1990s. Often his work has a comic edge, such as with the comic murder anthology Murder Most Horrid (BBC TWO, 1991) and the comedy-drama The Last Englishman (1995), starring Jim Broadbent. In 2001 he created a drama anthology series of his own for the BBC, Murder in Mind, an occasional series which deals with a different set of characters and a different murder every one-hour episode. His books for children include the Alex Rider series about the teenage secret agent: Stormbreaker (2000), which is currently being filmed; Point Blanc (2001); Skeleton Key (2002); Eagle Strike (2003); Scorpia (2004); and most recently, Ark Angel (2005). Further series are the Diamond Brothers series of mystery stories and the Groosham Grange series - the most recent of which is Return to Groosham Grange (2003). He also writes short stories and these, originally collected as Horowitz Horror (1999) and More Horowitz Horror (2000), have now been reissued as Scared (2000). His most recent books are Raven's Gate (2005) and Ark Angel (2005), the latter winning the 2006 British Book Awards Children's Book of the Year. He is also the writer of a feature film screenplay, The Gathering, which was released in 2002 and starred Christina Ricci.