The US doughnut and coffee chain announced a deal last month to open 150 restaurants in the UK over the next five years in an attempt to take on competitors such as Krispy Kreme.
The company pulled out of the UK in the mid-90s.
Nexus/H will lead Dunkin’ Donuts’ marketing in the UK, with an emphasis on digital, social and in-store activity. The brand’s first integrated campaign will launch in November.
The company has more than 10,500 restaurants in 31 countries. Its parent group, Dunkin’ Brands, also owns Baskin-Robbins.
Clare Starling, the UK marketing manager for Dunkin’ Brands, said Nexus/H’s appointment is "a key component to our launch success in the country".