William Brent Bell (born September 17, 1980) is an American filmmaker. He is best known for directing horror films such as "Stay Alive" (2006), "The Devil Inside" (2012), "Wer" (2013), "The Boy" (2016), "Brahms: The Boy II" (2020), "Separation" (2021), "Orphan: First Kill" (2022), and "Lord of Misrule" (2023). He is the founder of production company The Machine Room.