I Know Who Killed Me is a 2007 American psychological thriller film directed by Chris Sivertson, written by Jeff Hammond, and starring Lindsay Lohan, Julia Ormond, Neal McDonough and Brian Geraghty. The film's story revolves around a young woman who is abducted and tortured by a sadistic serial killer. After surviving the abduction, she insists that her identity is that of another woman.

I Know Who Killed Me was released by TriStar Pictures on July 27, 2007. The film received intense negative media coverage during production and upon its release, as Lohan publicly struggled with addiction and other personal issues. It was promptly deemed a failure and called one of the worst films ever made, being the most awarded at the 28th Golden Raspberry Awards, winning seven of eight nominations. It did, however, attain a more successful home video performance, having almost quadrupled its U.S. box office gross in estimated domestic DVD sales. The film subsequently developed a cult following that has reexamined it as a modern giallo and several screenings of it have been put together by historic theaters and film festivals.