The 2004 FA Cup Final was the 123rd FA Cup Final and the fourth to be played at the Millennium Stadium, the Welsh national stadium in Cardiff, due to the ongoing reconstruction of the usual venue, London's Wembley Stadium. The match took place on 22 May 2004 and it was contested by Manchester United, who had finished third in the Premier League that season, and Millwall, who had finished 10th in the First Division.

Manchester United secured a record 11th FA Cup victory with a headed goal from Cristiano Ronaldo and a brace from Ruud van Nistelrooy, which included a penalty kick. In contrast, it was Millwall's first appearance in a final of either the FA Cup or the Football League Cup. At the trophy presentation after the match, the Manchester United players wore shirts bearing the name and number of midfielder Jimmy Davis, who died in a road accident in August 2003.

The match was refereed by Jeff Winter. Tony Green and Roger East were the assistant referees and Matt Messias was the fourth official.

Manchester United were appearing in their 16th FA Cup final and had won it on 10 of their previous 15 appearances. Two of these victories had yielded a League and FA Cup double (in 1994 and 1996) and in 1999 they had won the FA Cup as part of an unprecedented treble of Premier League, Champions League and FA Cup wins.

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