The 2004–05 season was the 107th season of competitive football played by Arsenal. The club ended the campaign as FA Cup winners, but failed to retain their Premier League title as they finished second to Chelsea. In the UEFA Champions League, Arsenal made an exit in the knockout stages to Bayern Munich.

In the transfer window Arsenal purchased goalkeeper Manuel Almunia, who initially served a backup to Jens Lehmann, and midfielder Mathieu Flamini. The club kept hold of its captain Patrick Vieira after much transfer speculation over his expected move to Real Madrid. Several players left Arsenal before the campaign got under way; defender Martin Keown left to play for Leicester City, Ray Parlour joined Middlesbrough while Sylvain Wiltord signed for Lyon.

Arsenal began the season in good form and equalled Nottingham Forest's unbeaten league run of 42 matches against Middlesbrough. The team set a new English division record and went a further seven games unbeaten before losing to Manchester United in controversial circumstances. Arsenal's form suffered as a result and defensive shortcomings became more apparent; two draws and a defeat in November reinforced Chelsea's position at the top of the table, where they remained for the rest of the season. At home to Crystal Palace in February 2005, Wenger named an Arsenal squad with no English players – a first in the club's history which attracted criticism from the media. The team ended the season strongly, with a run of eight wins from nine games ensuring a second-place finish. 32 different players represented the club in five competitions and there were 15 different goalscorers. Arsenal's top goalscorer was Thierry Henry, who scored 30 goals in 42 games.

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