The 2011 SportAccord Convention will see more than 1,500 of the world's top sporting officials and business people from across the globe gather in the capital for the six-day event.
The event will initially contribute more than £3m to the economy, but is expected to generate many more millions through contracts for new businesses and other events.
Mayor of London Boris Johnson announced the win at the 2012 Business Summit held at Excel London today.
"This is a truly fantastic opportunity for the capital. Delivering a legacy for London after the Games is crucially important and SportAccord will now play a significant role in helping us achieve this," he said.
Olympics minister Tessa Jowell commented: "The SportAccord Convention is an excellent opportunity for UK businesses to showcase their expertise gained from working on London 2012 to key players in the international event supplier sector.
"With preparations for the London Games reaching fever pitch in 2011, SportAccord will be a vital forum for British companies looking to capitalise on the business benefits of 2012 and take their experience overseas."
The bid was co-ordinated by the Events for London team at Visit London and was funded by several of the UK's sporting and business bodies.
The event will take place from 3 - 8 April 2011 at the new .
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