Kaper will work alongside Maille’s global advertising agency, adam&eveDDB, as Unilever plans an expansion of the brand across key markets around the world.
Kaper managed the launch of Maille’s first international boutique in London’s Piccadilly last year, with a second due to open in New York later this year.
The agency has been working on Maille’s UK account since 2011.
David Lowes, senior vice-president, dressings, Unilever, said: "Maille is a jewel of a brand for which we have exciting global expansion plans. We are delighted to be working with Kaper globally to create the experiences, engagement and exclusivity befitting a premium food proposition."
Chris McCafferty, founder of Kaper, added: "Unilever was one of the first companies to buy into Kaper’s vision of modern, evolved PR. As passionate advocates of Maille, we are hugely proud to be working with Unilever to grow this wonderful brand on a global scale."
Meanwhile it is understood that Unilever is also looking for a global PR agency for its spreads business, which includes key brand Flora.