The 2003–04 season was Arsenal Football Club's 12th season in the Premier League and their 78th consecutive season in the top flight of English football. It began on 1 July 2003 and concluded on 30 June 2004, with competitive matches played between August and May. The club ended the Premier League campaign as champions without a single defeat – a record of 26 wins and 12 draws. Arsenal fared less well in the cups, eliminated in the FA Cup and League Cup semi-finals to Manchester United and Middlesbrough respectively, and at the quarter-final stage of the UEFA Champions League to Chelsea.

Jens Gerhard Lehmann is a German former professional footballer who played as a goalkeeper. He was a member of Arsenal's "Invincibles", playing every match of their unbeaten title-winning season. He holds the UEFA Champions League record for the most consecutive clean sheets, not conceding a single goal in eight consecutive full matches while he played for Arsenal. He also has the highest number of continuous minutes without conceding goals. In total, this lasted 853 minutes. He is regarded as one of the best goalkeepers of his generation.