Ronald Bronstein is an American screenwriter, film editor, director and actor. He directed, wrote and edited the independent film Frownland (2007). He frequently collaborates with the Safdie brothers, notably co-writing and co-editing Good Time (2017), Uncut Gems (2019), and Marty Supreme (2025). For Marty Supreme, he was nominated for Best Picture, Best Original Screenplay, and Best Editing at the 98th Academy Awards.