Sir Clive Woodward is leaving the British Olympic Association after six years.
The former England Rugby World Cup-winning manager has stood down as the BOA's director of sport.
He will retain an ambassadorial role and his seat on the International Olympic Committee's entourage commission.
Woodward will now concentrate on his media and speaking commitments, but his position had been under threat after a restructuring programme was agreed last month by the board of the cash-strapped organisation.
He said in a statement: "I have enjoyed being a part of Team GB enormously. To have been involved in three Olympic Games, Beijing 2008, Vancouver 2010 and especially London 2012, and chef de mission for the First Youth Winter Games in Innsbruck this year, has been an amazing experience.
"The challenge of delivering a home Olympic Games to our largest ever Olympic Team has been exhilarating and I would like to congratulate everyone concerned on the best Olympic performance of a host nation in the modern Games era.
"Post London 2012 is the right time for me to leave the BOA, which is now taking a new direction following a home Games and I wish them all well in the future."
Woodward will continue to chair the review of British Judo.
He added: "I am also delighted to accept a role as a Team GB Ambassador, this along with my position on the IOC entourage commission means that I will be staying in close contact with the Olympic world
"I will now be concentrating on my coaching, corporate speaking, media and other business interests."
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