IF is a 2024 American fantasy comedy drama 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.

12-year-old Bea moves into her grandmother Margaret's apartment in New York while her father waits for heart surgery in the same hospital where her mother died of cancer years earlier.

Returning to her grandmother's building, Bea goes to thank Cal only to discover that the door to his apartment opens into an old storage room as revealed by the landlady.

[8] In January 2022, Steve Carell, Alan Kim, Cailey Fleming, and Louis Gossett Jr. joined the cast, with the film retitled IF.

[13][14] Animation director Arslan Elver and VFX supervisor Chris Lawrence worked alongside Krasinski on set and during pre- and post-production.

[15][16] The film's end credits include Brad Pitt as Keith, an invisible IF with no lines, understood to be just offscreen when other characters trip over him.

[26] In the United States and Canada, IF was released alongside The Strangers: Chapter 1 and Back to Black, and was originally projected to gross around $40 million from 4,041 theaters in its opening weekend.

[28] In its second weekend, the film made $16.8 million (a drop of -53%), finishing third behind newcomers Furiosa: A Mad Max Saga and The Garfield Movie.

The website's consensus reads: "A sweet ode to rediscovering one's inner child, IF largely works as old-fashioned family entertainment despite an occasionally unfocused and unnecessarily complicated plot.

[32] Another mixed review was published on NPR by Bob Mondello, who wrote that "mostly the filmmakers detour, decorate and digitize their story rather than telling it, and that doesn't mesh well with the real-world stuff — dad's surgery, for instance, and Bea's wandering all over Brooklyn without her grandma seeming to notice.

[34] Tomris Laffly of Variety wrote that the movie was "in desperate need of some coherent world-building", while praising the performance of Cailey Fleming in the lead role.

[35] In a more negative review for The Hollywood Reporter, Frank Scheck criticised the film as "plagued by significant tonal shifts and pacing issues".

Despite the best efforts of the extremely talented child actor Cailey Fleming, IF makes no sense, narratively, emotionally, or visually.