The 2017–18 season was Sunderland's 139th season in existence, and their first season in the Championship since 2006, after relegation from the Premier League in the previous season. Along with competing in the Championship, the club also participated in the FA Cup and EFL Cup. The season covered the period from 1 July 2017 to 30 June 2018. The events of the season formed the backdrop to the first series of the documentary programme Sunderland 'Til I Die, which was released on Netflix on 14 December 2018.