Nancy Drew and the Hidden Staircase is a 2019 American teen mystery comedy film, based on the book The Hidden Staircase by Carolyn Keene. It was directed by Katt Shea, with a screenplay by Nina Fiore and John Herrera, and served as a reboot of the Nancy Drew film series. The movie, produced by A Very Good Production and Red 56 and distributed by Warner Bros. Pictures, stars Sophia Lillis in the role of amateur detective Nancy Drew, as she investigates a haunted house. It also stars Zoe Renee, Mackenzie Graham, Laura Slade Wiggins, Sam Trammell, and Linda Lavin in supporting roles. The same book had been adapted for a film of the same title in 1939.

Nancy Drew and the Hidden Staircase was released in the United States on March 15, 2019, by Warner Bros. Pictures. The film received positive reviews from critics, despite being a box-office bomb.