The 2021–22 Charlton Athletic season was the club's 116th season in their existence, after having been founded in 1905, and their second back in League One following relegation from the Championship in 2020. Along with competing in League One, the club also participated in the FA Cup, EFL Cup and the EFL Trophy. The season covered the period from 1 July 2021 to 30 June 2022.