I Know What You Did Last Summer is a 2025 American slasher film directed by Jennifer Kaytin Robinson, who co-wrote the screenplay with Sam Lansky from a story by Leah McKendrick and Robinson. It is a sequel to I Still Know What You Did Last Summer (1998)[a] and the fourth installment in the I Know What You Did Last Summer franchise. The film stars Madelyn Cline, Chase Sui Wonders, Jonah Hauer-King, Tyriq Withers, Sarah Pidgeon, Billy Campbell, Gabbriette Bechtel, and Austin Nichols, with Freddie Prinze Jr., Jennifer Love Hewitt, Sarah Michelle Gellar and Brandy reprising their roles from the first two films. The plot takes place 27 years after the Tower Bay murders, when another hook-wielding killer appears and begins targeting a group of friends one year after they covered up a car accident in which they supposedly killed someone.

I Know What You Did Last Summer premiered at The United Theater on Broadway in Los Angeles on July 14, 2025, and was theatrically released by Sony Pictures Releasing in the United States on July 18.