Original Adidas football shirt Arsenal 2021/22

The 2021–22 season was the 136th in the history of Arsenal Football Club. It began on 1 July 2021 and concluded on 30 June 2022, with competitive matches played between August and May. This was Arsenal's 30th season in the Premier League, their 103rd consecutive season in the top-flight of English football, and their 112th season in the top-flight overall. In addition to the domestic league, Arsenal also participated in the FA Cup and EFL Cup, but they did not participate in any European competition for the first time since the 1995–96 season, owing to an eight-place finish the previous season.

Managed by Mikel Arteta in his second full season, Arsenal were the youngest team in the Premier League with an average starting age of 24 years and 308 days – more than a whole year younger than the next team. They finished fifth in the Premier League, and qualified for next season's UEFA Europa League.

The season was documented in the Amazon Prime Video series All or Nothing: Arsenal.