Cardiff City defeat Arsenal in the FA Cup Final, the only time it has been won by a team not based in England.

Cardiff City Football Club is a professional association football club based in Cardiff, Wales. It currently competes in EFL League One, the third tier of the English football league system in the 2025–26 season following relegation. Founded in 1899 as Riverside A.F.C., the club changed its name to Cardiff City in 1908 and entered the Southern Football League in 1910 before joining the English Football League in 1920. The team has spent 17 seasons in the top tier of English football, the longest period being between 1921 and 1929. Their most recent season in the top flight was the 2018–19 Premier League season.

The Arsenal Football Club, commonly known as simply Arsenal, is a professional football club based in Islington, North London, England. They compete in the Premier League, the top tier of English football. In domestic football, Arsenal have won 13 league titles, a record 14 FA Cups, 2 League Cups, 17 FA Community Shields, and a Football League Centenary Trophy. In European football, they have one European Cup Winners' Cup and one Inter-Cities Fairs Cup. In terms of trophies won, it is the third-most successful club in English football.

The 1927 FA Cup final was an association football match between Cardiff City and Arsenal on 23 April 1927 at the Empire Stadium. The final was the showpiece match of English football's primary cup competition, the Football Association Challenge Cup, organised by the Football Association. Cardiff, one of the few Welsh teams taking part, won the match 1–0. Their victory remains the only occasion the trophy, which was previously widely referred to as the "English Cup", has been won by a team based outside England.