I Know What You Did Last Summer is an American teen slasher television series based on the 1973 novel of the same name by Lois Duncan. It was adapted for Amazon Prime Video by Sara Goodman and is produced by Amazon Studios and Sony Pictures Television Studios, in association with Original Film, Mandalay Television and Atomic Monster. Part of the I Know What You Did Last Summer franchise, the series is a modern take on the original novel and follows a group of friends stalked by a brutal killer one year after covering up a car accident in which they killed someone. It features a cast led by Madison Iseman, Brianne Tju, Ezekiel Goodman, Ashley Moore, and Sebastian Amoruso, and also stars Bill Heck, Fiona Rene, Cassie Beck, and Brooke Bloom.

Amazon Studios announced the series's development in 2019, with Neal H. Moritz and James Wan serving as executive producers. It was given a straight-to-series order in October 2020. Filming took place in Oahu and began in January 2021. The first four episodes premiered to mixed reviews on Amazon Prime Video on October 15, 2021, with the remaining episodes debuting on a weekly basis. In January 2022, the series was canceled after one season.