Freddy vs. Jason is a 2003 American slasher film directed by Ronny Yu and written by Damian Shannon and Mark Swift. It is a crossover between A Nightmare on Elm Street and Friday the 13th, being the eighth installment in the Elm Street franchise and the eleventh in the Friday the 13th franchise. The film stars Monica Keena, Kelly Rowland, Jason Ritter, Christopher George Marquette, Lochlyn Munro, and Robert Englund.

The film combines the two series in a shared universe and pits their respective antagonists, Freddy Krueger and Jason Voorhees, against each other. Freddy is weakened and forgotten because the citizens of his home town Springwood have defeated him by using medications that repress dreams. Freddy awakens Jason to stir up fear and grow his powers so that he may return and kill again. Jason turns out to not be as easily controlled as Freddy initially thought, and the two supernatural mass murderers come into conflict. The film is the last film in each franchise before their respective reboots: A Nightmare on Elm Street and Friday the 13th.

Freddy vs. Jason was released in the United States on August 15, 2003. The film received mixed reviews from critics, but grossed $116.6 million worldwide, making it the highest-grossing film in both franchises. The film marks Robert Englund's final portrayal as Freddy Krueger. A sequel and crossover with the Evil Dead franchise was planned, but it was scrapped and turned into a comic book limited series, Freddy vs. Jason vs. Ash, and its follow-up The Nightmare Warriors.