It comes shortly after The Romans parted ways with BrewDog, the brewer that has had a long-running feud with Diageo.
The agency is understood to have been given a wide-ranging comms remit, reporting to Diageo’s culture and entertainment team, led by Leila Fataar.
The agency was appointed after a competitive pitch and will work on the brand alongside ad agency Anomaly, which launched a campaign for Gordon’s in November under the tagline 'Shall we…?'.
In a joint statement, Romans founders Misha Dhanak and Joe Sinclair said: "The Gordon's brief presents a huge creative and cultural opportunity to differentiate an iconic household favourite amongst an increasingly diverse competitive set. Diageo’s commitment to creating conversations through Culture and Entertainment chimes closely with the very reason we set up The Romans."
A Diageo spokesperson confirmed the appointment.
The Romans and BrewDog parted ways at the start of this month, with the brewer moving its PR account back to Manifest.
BrewDog has had a feud with Diageo dating back to 2012 when the drinks giant blocked the Scottish craft brewer from winning an industry award. Diageo later apologised for its actions.
Last year BrewDog promised to "take revenge" on Diageo when it released a beer called Jet Black Heart, which mocked the famous Surfer ad for Diageo brand Guinness. The Romans did not work on that campaign, the agency said.