I Know What You Did Last Summer (disambiguation)

I Know What You Did Last Summer is a 1997 American slasher film based on the 1973 novel.

I Know What You Did Last Summer may also refer to:

Franchise

 * I Know What You Did Last Summer (novel), a 1973 suspense novel for young adults by Lois Duncan
 * I Know What You Did Last Summer (franchise)
 * I Still Know What You Did Last Summer, a 1998 slasher film and a sequel to the 1997 film
 * I'll Always Know What You Did Last Summer, a 2006 horror film released straight to DVD and the third installment in the series
 * I Know What You Did Last Summer (TV series), a 2021 Amazon Prime TV series

Other uses

 * "I Know What You Did Last Summer" (Supernatural), an episode of the TV series Supernatural
 * "I Know What You Did Last Summer" (The Vampire Diaries), an episode of the TV series The Vampire Diaries
 * "I Know What You Did Last Summer" (Scream), an episode of the TV series Scream
 * "I Know What You Did Last Summer" (song), a 2015 song by Shawn Mendes and Camila Cabello
 * "I Know What You Did Last Summer", a 2015 song by Jacob Whitesides featuring Kelly Rowland