Mike Flanagan (born May 20, 1978) is an American filmmaker best known for his horror work. Flanagan wrote, directed, produced, and edited the horror films Absentia (2011), Oculus (2013), Hush, Before I Wake, Ouija: Origin of Evil (2016), Gerald's Game (2017), and Doctor Sleep (2019). He created, wrote, produced, and served as showrunner on the Netflix horror series The Haunting of Hill House (2018), The Haunting of Bly Manor (2020), Midnight Mass (2021), The Midnight Club (2022), and The Fall of the House of Usher (2023), also directing and editing some if not all episodes of each.

Flanagan is married to actress Kate Siegel, who has been featured in most of his works since Oculus. They also wrote the screenplay of Hush together. Other frequent collaborators include Carla Gugino, Henry Thomas, Samantha Sloyan, Rahul Kohli, Bruce Greenwood, Zach Gilford, Michael Trucco, Annalise Basso, Lulu Wilson, Annabeth Gish, Katie Parker and Alex Essoe.