The London Marathon has signed a contract to manage the 2012 Olympic and Paralympic marathons.
The organisation, which raised more than £22m for charity through the race this year, agreed a deal with the London Organising Committee of the Olympic Games to assist in the design of the courses and provide personnel and equipment for the races.
A spokesman for Locog said the partnership was not a commercial agreement and no money would be changing hands.
David Bedford, race director of the London Marathon, said the contract had not been open to bids from other organisations. "It makes sense to choose the biggest marathon organiser in the country to manage the Olympic and Paralympic marathons, and this is a stamp of approval from Logoc."
He said the decision to manage the marathons was taken after an agreement between the London Marathon company and its charitable trust had been made.