I Know What You Did Last Summer

I Know What You Did Last Summer
Theatrical release poster
Directed by	Jim Gillespie
Produced by	Neal H. Mortiz Erik Feig Stokely Chaffin
Written by	Kevin Williamson
Based on	I Know What You Did Last Summer by Lois Duncan
Starring	Jennifer Love Hewitt Sarah Michelle Gellar Ryan Phillippe Freddie Prinze, Jr. Johnny Galecki Bridgette Wilson
Music by	John Debney
Cinematography	Denis Crossan
Edited by	Steve Mirkovich
Production company	Mandalay Entertainment
Distributed by	Columbia Pictures
Release date	October 17, 1997 (1997-10-17)
Running time	101 minutes
Country	United States
Language	English
Budget	$17 million
Box office	$125.2 million

I Know What You Did Last Summer is a 1997 American slasher film written by Kevin Williamson and directed by Jim Gillespie. The film is loosely based on the 1973 novel of the same name by Lois Duncan. The film also draws inspiration from the urban legend known as The Hook.

The film stars Jennifer Love Hewitt, Sarah Michelle Gellar, Ryan Phillippe and Freddie Prinze, Jr., with Anne Heche, Bridgette Wilson, and Johnny Galecki appearing in supporting roles. I Know What You Did Last Summer centers on four friends who are being stalked by a killer, one year after covering up a car accident in which they were involved. The film was directed by Jim Gillespie, from a screenplay written by Kevin Williamson, writer of Scream.

I Know What You Did Last Summer received mixed reviews from critics, but was commercially successful, grossing over $125 million at the box office. It was also nominated for and won multiple awards. As a result, the film has been parodied and referenced in popular culture.

The film was followed by two sequels, I Still Know What You Did Last Summer (1998) and the straight-to-DVD release I'll Always Know What You Did Last Summer (2006). Though the former film sees a continuation of the plotline established in its predecessor, the latter film establishes a new plotline and does not star any cast members from the previous two installments.