The new beer, which will be available in 440ml cans in Tesco stores from today and other stores in the coming weeks, has already been on sale in the US for a number of months.
According to Guinness, the drink picks up on the existing coffee flavours in a pint of Guinness by adding cold brew coffee, which has been steeped in cold water for long periods.
The drink has around 2mg of caffeine per can, about the same as a cup of decaf coffee.
“The coffee notes already in Guinness make the creation of Guinness cold brew coffee beer a natural – and delicious – next step in our proud history of innovation,” said Grainne Wafer, global brand director for Guinness.
She said the company hoped the product would introduce new consumers to the brand.
Guinness hopes to launch the produce in more countries across Europe and Asia this year.
It comes amid a major expansion of the Guinness brand beyond the traditional pints it is best known for.
Over the last year, Diageo has launched Guinness MicroDraught, which allows people to pour a pub-quality pint of Guinness at home, as well as the alcohol-free beer Guinness 0.0%.
The building will house a microbrewery producing limited edition beers, a Guinness shop, plus rooftop bar and kitchen. The site will also serve as the home of Guinness’s London training programme.
Guinness is one of FTSE 100 drinks giant Diageo’s biggest brands. It also owns brands such as Smirnoff vodka, Captain Morgan Rum and Don Julio tequila.