The agency has been asked to provide global public relations for the World Series of Boxing (WSB) tournament, which begins this September.
The account will be led from Weber Shandwick's Geneva office, supported by London's sports practice.
WSB chief operating officer Ivan Khodabakhsh said: ‘It is vital we are able to communicate a wealth of information quickly and effectively to a wide range of stakeholders over the coming months and build the WSB brand.'
The tournament will involve Olympic-standard boxers, who will for the first time experience regular competition over at least four months, boxing over five rounds. The PR campaign covers the full spectrum of media services ranging from practical tool kits to digital and online communications.
Weber Shandwick will also offer WSB franchise teams a prepackaged solution for local communications that can be integrated into the global campaign.
The agency will report to director of PR and communications for AIBA and WSB Paul O'Neil.
The contract covers the period until April 2011, which will mark the end of the inaugural WSB season.
The WSB will be held annually, allowing aspiring boxers to compete professionally without having to sacrifice competing on behalf of their countries at the Olympic Games.
The new tournament will feature 12 franchise teams spread across three regional conferences - Asia, Europe and the Americas - competing for team and individual championship titles.
This follows last month's news that Weber Shandwick co-head Scott Bowers is to leave the agency to become director of communications at The Jockey Club.
He leaves co-head Fiona McLachlan to run the division in his absence.