Sir Bobby Charlton said: "I have always said that we wanted the next manager to be a genuine Manchester United man. In David Moyes, we have someone who understands the things that make this such a special club.
“We have secured a man who is committed to the long-term and will build teams for the future as well as now. Stability breeds success.
“David has tremendous strength of character and recognises the importance of bringing young players through and developing them alongside world class talent.
"At United, I think David will be able to express himself. I’m delighted he has accepted and I’m looking forward to working with him.”