| Release Date | 17 October 1997 |
| Budget | $17,000,000 |
| US Box Office | $72,000,000 |
| Tagline | He's got a hook on them... |
| Genre | Crime, Horror, Mystery, Thriller |
| Country | USA |
| Filming Locations | Bodega Bay, California, USA |
| Language | English |
| Sound Mix | Dolby SR, SDDS |
| Color | Color |
| Film Type | Feature |
| Film Class | Slasher Film, Teen Movie |
| Mood | Nail-biters |
| Themes | Serial Killers, Mind Games |
| Tones | Creepy, Paranoid, Tense, Menacing |
| Tags | Beauty Contest, Boyfriend, Fisherman, Guilt, Hit And Run, Maniac, Stalking |
I Know What You Did Last Summer is a 1997 American horror film. The film stars Jennifer Love Hewitt, Sarah Michelle Gellar, Ryan Phillippe and Freddie Prinze Jr.. The screenplay was written by Kevin Williamson, writer of Scream, and very loosely based on Lois Duncan's popular novel of the same title. The film was followed by two sequels, I Still Know What You Did Last Summer and the straight-to-DVD release I'll Always Know What You Did Last Summer. The latter film did not star any of the cast from the previous two.