Euro RSCG Wnek Gosper has been handed Alberto Culver's dollars 40 million international advertising account for the haircare brand VO5 without a pitch.
The decision to move agencies in the UK comes just four months after M&C Saatchi was appointed to the business.
This latest change in agency is the result of a new globalisation strategy, according to Barton Warner, the vice-president of international marketing at Alberto Culver.
The move follows last month's appointment of Euro RSCG Tatham of Chicago to handle the VO5 brand across Canada and the US. Euro RSCG Wnek Gosper will create the advertising for the rest of the world.
The media account, held by Carat, is not thought to be affected by the changes.
Mark Wnek, the executive creative director at Euro RSCG Wnek Gosper, said: 'It's very exciting to win our biggest ever piece of business. It's wonderful for the London office to be handling a product sold in over 120 countries around the world.'