Pet Sematary: Bloodlines is a 2023 American supernatural horror film directed by Lindsey Anderson Beer (in her directorial debut), and co-written by Beer and Jeff Buhler. It serves as a prequel to Pet Sematary (2019), which in turn was based on the 1983 novel of the same name by Stephen King. It is the fourth installment of the Pet Sematary film series and stars Jackson White, Forrest Goodluck, Jack Mulhern, Henry Thomas, Natalie Alyn Lind, Isabella Star LaBlanc, Samantha Mathis, Pam Grier and David Duchovny. Set in 1969, 50 years before the events of the previous film, the plot follows a young Jud Crandall as he discovers a local Native American cemetery where the dead can live again, without realizing the horror that will affect his life.

After the commercial success of Pet Sematary in 2019, producer Lorenzo di Bonaventura had plans for a prequel explaining the mythology and universe of the film. In February 2021, the film was green-lit, with Buhler and di Bonaventura returning in their roles as screenwriter and producer, respectively. Beer signed on as director in May 2021 and principal photography began in August of the same year.

Pet Sematary: Bloodlines premiered at Fantastic Fest on September 23, 2023, and was followed by its streaming launch on Paramount+ on October 6 and received generally negative reviews from critics.