Jesse Lingard scored the winner in extra-time with a thunderous effort to gift Louis Van Gaal a first major trophy as United manager.
The 23-year-old volleyed home a Damien Delaney’s half clearance to put his side ahead with just 10-minutes remaining.
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Juan Mata had earlier cancelled out Jason Puncheon opener to take the game into extra-time.
Chris Smalling was sent off in extra-time before Lingard’s winner claimed the trophy for the Red Devils.
United have now equaled Arsenal’s record (12) as the club who has won the FA Cup the most.
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