
Beckham will join Gary and Phil Neville, Ryan Giggs, Nicky Butt and Paul Scholes alongside businessman Peter Lim who will remain the largest shareholder with 40%.
Salford are currently third in the National League, the fifth-tier division, having been taken over by the former United players in 2014.
The 43-year-old Beckham was the only member of the famous group of young players, who enjoyed so much success under Alex Ferguson, not to have invested in the team.
“It’s a really special club and a special group of people. My early years in Manchester were all spent in Salford. I grew up there in many ways so to be able to finally join the lads and the club today is a great feeling,” Beckham said in a club statement.
The former Real Madrid and LA Galaxy midfielder also has an ownership stake in future Major League Soccer team Inter Miami.