The 2009–10 season was Arsenal Football Club's 18th season in the Premier League. Arsenal's this season began with a 1–6 victory away to Everton. Arsenal suffered back-to-back Premier League losses on four occasions this season, but finished the season third in the Premier League. Arsenal also advanced to the quarter-finals of the UEFA Champions League, but were knocked out by reigning champions Barcelona in a two-legged tie, having first eliminating Scottish club Celtic 5–1 on aggregate in the play-off round, finishing top their group, which included Greek club Olympiacos, Belgian club Standard Liège, and Dutch club AZ, with 13 points during the group stage, and overcoming a first-leg deficit to beat Porto 6–2 on aggregate in the first knockout round.

The side's continuing sportsmanship was acknowledged at the end of the season with Arsenal winning the Barclays Fair Play Award.

A total of 20 teams competed in the Premier League in the 2009–10 season. Each team played 38 matches; two against every other team and one match at each club's stadium. Three points were awarded for each win, one point per draw, and none for defeats. At the end of the season the top three teams qualified for the group stages of the UEFA Champions League; the team in fourth needed to play a qualifier.

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