Oldboy (Hangul:올드보이) is a 2003 South Korean film directed by Park Chan-wook based on a Japanese manga of the same name, written by Minegishi Nobuaki and Tsuchiya Garon. The film can be described as a psychological thriller, using many elements of film noir to examine the nature of sin and morality. Distinct themes of Greek tragedy are also present, especially as the storyline holds several parallels to that of Sophoclean plays. The bare outlines of the plot are reminiscent of The Count of Monte Cristo (the director himself makes the homage explicit at one point), but the movie diverges very freely from its source. It is the second installment of Park's "vengeance trilogy", preceded by Sympathy for Mr. Vengeance and followed by Sympathy for Lady Vengeance.

The film won the Grand Prix at the 2004 Cannes Film Festival and high praise from the President of the Jury, director Quentin Tarantino, who couldn't persuade the members of the jury to give it the Palme d'Or over Fahrenheit 9/11. Critically, the movie has been well received in the United States, with an 81% "Certified Fresh" rating at Rottentomatoes.com; well known film critic Roger Ebert has claimed Oldboy to be a "powerful film".Currently, Oldboy has been voted onto the IMDb Top 250 by its users.

The American remake is currently on hold; and previously announced director Justin Lin, best known for the teen crime drama Better Luck Tomorrow, is no longer attached. Zinda, the Bollywood film directed by Sanjay Gupta, also bears a striking resemblance to Oldboy, but is not an officially sanctioned remake. Zinda is now under investigation for violation of copyright.

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