The 2013–14 season was Manchester United's 22nd season in the Premier League, and their 39th consecutive season in the top-flight of English football.

David Moyes began the season as United's new manager after taking over from Sir Alex Ferguson, who retired after 27 years in charge. He had actually been announced as the club's new manager before the end of the previous season, but did not officially take over until 1 July 2013.

Despite winning the Community Shield, United were soon struggling in the league and endured some of their worst results since the end of the 1980s. In January, United were knocked out of their two domestic cup competitions, eliminated from the FA Cup at the first hurdle with a loss to Swansea City, as well as from the semi-finals of the League Cup after being beaten on penalties by Sunderland.

United fared better in Europe, topping their group in the group stage. They suffered a scare when they lost to Olympiacos in the first leg of the round of 16, but overcame the deficit in the second leg. United were ultimately eliminated during the quarter-finals in April, with Bayern Munich beating them 4–2 on aggregate.

On 22 April 2014, with four games remaining, Moyes was sacked as manager, less than a year into his six-year contract. His last game, two days earlier, had ended in 2–0 defeat at his old club Everton. 40-year-old player-coach Ryan Giggs was placed in charge for United's remaining games, from which they collected seven points. A seventh place in the league was United's lowest finish since 1990 and meant that they had missed out on European qualification for the first time since 1989–90 (when English clubs were still banned from European competitions due to the Heysel disaster of 1985). The last time outside the Heysel ban era that United had missed out on a place in Europe was in 1980–81.

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