1998–99 Manchester United F.C. season

The 1998–99 season was Manchester United Football Club's seventh season in the FA Premier League and their 24th consecutive season in the top division of English football. After finishing the previous season without winning any trophies, United won the Treble of the Premier League, FA Cup, and UEFA Champions League in 1998–99, the first side in English football to do so. During the campaign, United lost only five times: in the Charity Shield against Arsenal; in the fifth round of the League Cup against eventual winners Tottenham Hotspur; and three times in the league, including their only home loss all season, against Middlesbrough in December 1998. A run of 33 games unbeaten in all competitions began on 26 December at home to Nottingham Forest, whom they beat 8–1 away from home in February 1999. The season was characterised by comebacks, including the FA Cup fourth round against Liverpool, the semi-finals of the Champions League against Juventus, and the Champions League final, when Teddy Sheringham and Ole Gunnar Solskjær scored in injury time to overturn Bayern Munich's early lead.

Veteran players Gary Pallister and Brian McClair had left the club before the season began, but their replacements, Dutch defender Jaap Stam from PSV Eindhoven and Trinidadian striker Dwight Yorke from Aston Villa, were both signed for club record fees. In November 1998, goalkeeper Peter Schmeichel announced his intention to leave the club after eight years at Old Trafford, joining Sporting CP at the end of the season. The club was subjected to a takeover bid of more than £600 million from BSkyB early in the season, but it was blocked by the Monopolies and Mergers Commission in March 1999.

Fans and writers regard the Treble as manager Alex Ferguson's greatest achievement. In recognition of his success, Ferguson was awarded a knighthood and handed the Freedom of the City of Glasgow in November 1999. David Beckham was named UEFA Club Footballer of the Year for the 1998–99 season, and was runner-up to Rivaldo for 1999's Ballon d'Or and FIFA World Player of the Year awards. As of 2025, the Treble has only been matched once by an English club: by local rivals Manchester City in the 2022–23 season.