The agency won the business after a pitch process that started in October last year.
Arnold KLP’s first work will break in October with a TV-led campaign. The focus will be on Douwe Egberts’ Instant range, but it will highlight all products.
Douwe Egberts previously worked with CST The Gate.
Corrine Hopwood, the marketing director at Douwe Egberts UK, said: "We believe great ideas will fuel our growth and Arnold demonstrated they are the right agency with the right integrated balance of skills to help us with our ambitious plans."
Hugh Treacy, the managing director of Arnold KLP UK, said: "Douwe Egberts is a challenger brand with massive potential."