Brian Duffield (born November 5, 1985) is an American filmmaker. He wrote and directed the 2026 survival thriller film Whalefall, the 2023 sci-fi horror film No One Will Save You and the 2020 dark comedy coming-of-age film Spontaneous. His previous writing credits include Love and Monsters (2020), Underwater (2020), The Babysitter (2017) and Insurgent (2015). He is known for having multiple spec scripts featured in The Black List, an industry log of highly regarded but unproduced screenplays, including his scripts for Jane Got a Gun (2015) and Your Bridesmaid is a Bitch.