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 (including one unbeaten title), 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.

Arsenal was the first club from southern England to join the Football League in 1893, and it reached the First Division in 1904. Relegated only once, in 1913, it continues the longest streak in the top division, and has won the second-most top-flight matches in English football history. In the 1930s, Arsenal won five League Championships and two FA Cups, and another FA Cup and two Championships after the war. In 1970–71, it won its first League and FA Cup double. Between 1989 and 2005, they won five league titles and five FA Cups, including two more doubles. They completed the 20th century with the highest average league position. Between 1998 and 2017, Arsenal qualified for the UEFA Champions League for an English football record nineteen consecutive seasons.

In 1886, munitions workers at the Royal Arsenal in Woolwich founded the club as Dial Square. In 1913, the club crossed the city to Arsenal Stadium in Highbury, becoming close neighbours of Tottenham Hotspur, and creating the North London derby. Herbert Chapman won the club its first silverware, and his legacy enabled a trophy-laden period in the 1930s. He helped introduce the WM formation, floodlights, and shirt numbers; he also added the white sleeves and brighter red to the club's jersey. Arsène Wenger was the club's longest-serving manager and won the most trophies. He won a record seven FA Cups, and his third and final title-winning team set an English record for the longest top-flight unbeaten league run at 49 games between 2003 and 2004, receiving the nickname The Invincibles.

In 2006, the club moved to the nearby Emirates Stadium. With an annual revenue of £367.1m in the 2021–22 season, Arsenal was estimated to be worth US$2.26 billion by Forbes, making it the world's tenth-most valuable football club, while it is one of the most followed on social media. The motto of the club is Victoria Concordia Crescit, Latin for \"Victory Through Harmony\".