Jon Croker is a British screenwriter. He entered the film industry working in production and script development roles, including serving as a production assistant on Harry Potter and the Prisoner of Azkaban (2004) and as an assistant to director Mike Newell on Harry Potter and the Goblet of Fire (2005). He subsequently worked in script editing and development, contributing to the shaping of several British films, including Attack the Block (2011), The Iron Lady (2011), and The Deep Blue Sea (2011).