The 2012 Olympics in London could create up to £10bn for the UK economy as a whole, a report says.
Tourists are likely to descend on London in their thousands
Lloyds TSB said there would be a pronounced boost to business in the run-up to the Olympics but also benefits up to 2016.
Hotels and restaurants will benefit from visitors drawn by the Games, while building firms and retailers will also enjoy a boom.
David Morton of Lloyds TSB Business said 2012 was a "massive opportunity".
He told an Olympic business briefing: "Work is already under way to improve transport systems and develop the area's tourism infrastructure, but as the Games draw closer, many more opportunities will emerge."