The Join In Trust, backed by Lord Sebastian Coe, will be financed in its first year by the Social Action Fund
The Cabinet Office has provided £2m to a charity set up to build on the Olympics’ volunteering legacy.
The Join In Trust will encourage people across the country to get involved at their local sports facilities and promote volunteering in local community organisations and other institutions.
A spokesman for the charity said that it had received about £2m in funding through the Cabinet Office’s Social Action Fund, which would finance the group in its first year.
The charity will stage a Join In Local Sport event this weekend that will involve about 5,000 local sporting events taking place at sports clubs across the country.
The weekend will see current and former Olympians, including Jonathan Edwards, Daley Thompson and Sharron Davies, visit events up and down the country. The initiative is being backed by Lord Sebastian Coe, chair of Locog, the London 2012 organising committee, and the Prime Minister, David Cameron.
In a statement, Cameron said: "The fantastic spectacle of sport that we have all had the privilege to witness over the last fortnight would not have been possible without the commitment and dedication of the Games Makers and other volunteers.
"We need to make the most of this magic moment and harness the enthusiasm for sport and volunteering that the Games has generated. That's why the Join In Local Sport project is so important, so that we bring London 2012 back to the place it begins for every great champion: their local sports club and the great volunteers who make it all possible."
The Join In Trust board of trustees will include Justin Davis Smith, chief executive of Volunteering England, and Lucy de Groot, chief executive of Community Service Volunteers. The board will be chaired by Sir Charles Allen, a former chief executive of ITV.