Jaws 3 (1983) is about the unfamous shark who becomes intertwined with the amusement park, Seaworld, and then continues to be exploited.
The Jack in the Box (2020) is about a clown contained in a box killing people and keeping them in the box with no evidence to being found.
Jeepers Creepers (2001) follows two siblings on their way back home for spring break, suddenly being chased by a flesh-eating creature.
Jennifer’s Body (2009) follows a young woman who transformed into a man-eating succubus after being sacrificed to the devil.
Jigsaw (2017) follows the investigation one suspect: John Kramer, the man known as Jigsaw, who has been dead for over 10 years.