Sir Alexander Matthew Busby (26 May 1909 – 20 January 1994) was a Scottish football player and manager, who managed Manchester United between 1945 and 1969 and again for the second half of the 1970–71 season. He was the first manager of an English team to win the European Cup and is widely regarded as one of the greatest managers of all time.

Before going into management, Busby was a player for two of Manchester United's greatest rivals, Manchester City and Liverpool. During his time at City, Busby played in two FA Cup Finals, winning one of them. After his playing career was interrupted by the Second World War, Busby was offered the job of assistant coach at Liverpool, but they were unwilling to give him the control that he wanted over the first team. As a result, he took the vacant manager's job at Manchester United instead, where he built the famous Busby Babes team that won successive Football League First Division titles and challenged for the European Cup. Eight of these players died in the Munich air disaster, but Busby rebuilt the team and won several more First Division titles as well as other domestic cups before he took United to European Cup glory a decade later. In a total of 25 years with the club, he won 13 trophies including five league championships and the European Cup.