The 2005 FA Cup Final was a football match played between Arsenal and Manchester United on 21 May 2005 at the Millennium Stadium, Cardiff. It was the final match of the 2004–05 FA Cup, the 124th season of English football’s primary cup competition, the FA Cup. Arsenal became the first team to win the FA Cup via a penalty shoot-out, despite being outplayed throughout the game, after neither side managed to score in the initial 90 minutes or in 30 minutes of extra time. The shoot-out finished 5–4 to Arsenal, with Patrick Vieira scoring the winning penalty after Paul Scholes' shot was saved by Arsenal goalkeeper Jens Lehmann.

As both teams were in the highest tier of English football, the Premier League, Arsenal and Manchester United entered the competition in the third round. Matches up to the semi-final were contested on a one-off basis, with a replay taking place if the match ended in a draw. Both clubs only needed one replay along the way to the final; Arsenal's tie against Sheffield United in the fifth round was decided by a penalty shootout, whereas Manchester United overcame non-league Exeter City in the third round, after the original tie ended goalless.

Protests over the impending takeover of Manchester United by American businessman Malcolm Glazer had threatened to overshadow the final, though demonstrations in Cardiff required little intervention from the police. Both managers for the final made surprising changes to their team; Arsène Wenger unconventionally deployed a defensive formation, while Sir Alex Ferguson left midfielder Ryan Giggs on the bench. Manchester United dominated the match, creating four times as many shots as their opponents, but struggled to find the breakthrough. In extra time, Arsenal's José Antonio Reyes was sent off for a second bookable offence, becoming only the second player to be sent off in an FA Cup final.

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