The 2021–22 Charlton Athletic season was the club's 116th season in their existence, 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.

Christopher Ross Gunter is a Welsh former professional footballer who played as a defender. An attacking full back, he was capable of playing on both flanks but usually played on his preferred right side. Since 2023, he has been a coach for the Wales national team.