Spiral (subtitled From the Book of Saw) is a 2021 American horror thriller film directed by Darren Lynn Bousman and written by Josh Stolberg and Peter Goldfinger. It is a spinoff and the ninth installment overall in the Saw film series, following Jigsaw (2017). The film stars Chris Rock, Max Minghella, Marisol Nichols, and Samuel L. Jackson, and follows police efforts to stop a Jigsaw copycat killer. The original creators of the series, James Wan and Leigh Whannell, as well as Rock and series veteran Kevin Greutert, serve as executive producers.

Talks of another Saw installment began after the release of the previous film, with Chris Rock wanting to branch out into the horror genre. The project was officially announced in May 2019, with Rock polishing a script by Stolberg and Goldfinger. The rest of the cast joined in July, with filming taking place in Toronto through that month and August.

Originally scheduled to be released in May 2020, Spiral was delayed due to the COVID-19 pandemic, and was theatrically released in the United States on May 14, 2021, by Lionsgate Films. The film grossed a total of $40.6 million against a budget of $20 million, becoming the lowest grossing installment in the franchise, and received mixed reviews from critics. In 2023, it was followed by a tenth installment, titled Saw X, which is set between Saw (2004) and Saw II (2005).