Sir Bobby played 758 times for United, scoring 249 goals, and the former midfielder celebrates his 80th birthday today.
And Beckham, who played at Old Trafford for 11 years, says Charlton was one of his heroes growing up.
"I was lucky enough to meet him when I went to the Bobby Charlton Soccer School at the age of 10 when I first came here, and I won it when I was 11," he said.
"That was when Sir Bobby contacted Manchester United and said ‘maybe you should have a look out for this young kid’.
"So I owe everything to Sir Bobby because, if not, maybe I wouldn’t have had the chance of living my dream of playing for the club that I’d supported for so many years and the club my Dad supported.
"It was a dream to meet him because he was my dad’s favourite player and my middle name Robert is after Sir Bobby.
"He would always try to help the young players. When you play for a club and you have ex-players that come and talk to you that are involved with the team, it means a lot.
“But when you have Sir Bobby Charlton come up to you and say well done or this is how you can do something better or this is how you represent the club, it means something.
"It means so much when you have someone of that stature and with that experience who is a legend at the club you support. He means so much to so many people, especially to Manchester United fans and England fans."
Sir Bobby left United in 1973 and had a brief spell as manager of Preston, before returning to Old Trafford in 1984 as a director, a position he still holds.
Man Utd return to Premier League action this weekend with a trip to fierce rivals Liverpool.
