Original Joma Swansea City 2017/18 football shirt

The 2017–18 season was Swansea City's 98th season in the English football league system, and their seventh consecutive season in the Premier League. Along with competing in the Premier League, the club will compete in the FA Cup and EFL Cup. The season covered the period from 1 July 2017 to 30 June 2018.

Swansea's relegation to the Championship was confirmed on 13 May 2018, the final day of the Premier League season, by virtue of them losing 2–1 at home to already relegated Stoke City, where only a win and a ten-goal difference swing over Southampton would have ensured survival.