Shaun of the Dead is a 2004 British romantic zombie comedy film directed by Edgar Wright, who co-wrote it with Simon Pegg. The film stars Pegg as Shaun, a downtrodden London salesman who gets caught alongside his loved ones in a zombie apocalypse. It also stars Nick Frost, Kate Ashfield, Lucy Davis, Dylan Moran, Bill Nighy, and Penelope Wilton. It is the first instalment in Wright and Pegg's Three Flavours Cornetto trilogy, followed by Hot Fuzz (2007) and The World's End (2013), both of which also star Pegg and Frost.

Shaun of the Dead was inspired by ideas Pegg and Wright used for their 1999-2001 television sitcom Spaced, particularly an episode in which Pegg's character hallucinates a zombie invasion. The film references the Night of the Living Dead films by George A. Romero. Principal photography took place across London and at Ealing Studios for nine weeks between May and June 2003.

Shaun of the Dead premiered in London on 29 March 2004, before it was theatrically released in the United Kingdom on 9 April 2004 and in the United States on 24 September. It was met with critical acclaim and commercial success, grossing $30 million worldwide on a budget of $6.1 million and receiving two nominations at the British Academy Film Awards. It was ranked third on the Channel 4 list of the 50 Greatest Comedy Films and quickly acquired a cult following. In film studies, it is seen as a product of post-9/11 anxiety and a model for transnational comedy, while the zombie outbreak as depicted in the film has been used as a modelling example for disease control.