Park Chan-wook (Korean: 박찬욱; pronounced [pak̚tɕʰanuk̚]; born 23 August 1963) is a South Korean filmmaker and former film critic. Widely regarded as a leading figure in South Korean and 21st-century world cinema, he is known for films that blend crime, mystery, and thriller elements with other genres. His films are noted for their cinematography, framing, black humour, and often brutal subject matter.

After two unsuccessful films in the 1990s, which he has since largely disowned, Park came to prominence with his acclaimed third directorial effort, Joint Security Area (2000), which became the highest-grossing film in South Korean history at the time and which Park himself prefers to be regarded as his directorial debut. Using his newfound creative freedom, he would go on to direct the films forming his unofficial The Vengeance Trilogy: Sympathy for Mr. Vengeance (2002), a financial failure that polarised critics, followed by Oldboy (2003) and Lady Vengeance (2005), both of which received critical acclaim and were financially successful. Oldboy in particular is regarded as one of the greatest films ever made, and helped establish Park as a well-known director outside his native country.