Tony Grisoni (born October 28, 1952, in London) is a British screenwriter. He wrote Queen of Hearts for Jon Amiel and co-wrote Fear and Loathing in Las Vegas, Tideland and The Man Who Killed Don Quixote with Terry Gilliam. His other screenplays include In This World, Brothers of the Head, Red Riding, The Unloved and How I Live Now, and his television work includes Southcliffe, The Young Pope, The City and the City and Marlow. He also teaches screenwriting at the London Film School.