The owner of Carling and Cobra called a review last autumn for the UK and Ireland, US and Canada markets, having worked with Zenith in the UK since 2009. Zenith repitched against Havas Media and Manning Gottlieb OMD.
The UK and US business will be handled by a bespoke unit called ‘Connect’ which is powered by Zenith in the UK & Ireland and Publicis Media in the US.
Initiative was its media agency in the US, while MEC has retained the Canadian business.
WPP’s Kinetic will continue to be the out-of-home partner in both the UK and US, having worked with Molson Coors since 1968.
Last month Carling appointed Havas London as its UK creative agency, having previously worked with Creature of London.
Martin Coyle, director of brands and consumer excellence at Molson Coors, said: "To achieve the Molson Coors ambition of becoming 'First Choice for Customers and Consumers', we must continually strengthen our message to beer and cider drinkers, including where and how we communicate.
"We choose to work with the best partners that can deliver thought leadership and industry-leading media buys, which connect our brands with consumers and shoppers. Zenith has delivered fantastic results for us and we look forward to continuing to work with our great team there."