Eulogy will work on the Coors Light Ice Bar campaign, promoting its pop-up bars in London and Manchester.
The agency will help Grolsch mark its 400th anniversary this year with a PR stunt inspired by Grolsch’s swing top bottle.
Eulogy will also work to raise awareness of Thai beer Singha in the UK, through a 'brand ambassador' programme and via social media.
The agency will handle the press office for the three brands.
Eulogy’s drinks portfolio currently includes Bowmore, Licor 43 and Auchentoshan.
Jane Hall, brands comms manager at Molson Coors, said: "We loved [Eulogy’s] enthusiasm for our brands and were impressed with the creative plans it developed for each individual brand to help us achieve our goals for each of them this year."
Last month Molson Coors hired Edinburgh-based Burt Greener Communications to run the PR for all of its brands in Scotland in a bid to boost trade in the Scottish market.