The 2017–18 season was Middlesbrough's first season back in the Championship, making an immediate return to the division following relegation from the Premier League in the previous season. In their 142nd year in existence, the club also competed in the FA Cup and the EFL Cup. The season covers the period from 1 July 2017 to 30 June 2018, with all competitive games played between August 2017 and May 2018. Two transfer windows took place, the first from 1 July to 31 August 2017, the second from 1 January to 31 January 2018.