IF is a 2024 American fantasy comedy film written, produced, and directed by John Krasinski. The film features an ensemble cast that includes Cailey Fleming, Ryan Reynolds, Krasinski, and Fiona Shaw with supporting roles done by Alan Kim and Liza Colón-Zayas, along with the voices of Phoebe Waller-Bridge, Louis Gossett Jr., and Steve Carell. Combining live-action and animation, the film follows a young girl (Fleming) who goes through a difficult experience and begins to see everyone's imaginary friends who have been left behind as their real-life children have grown up.