Sales are also up in the UK and emerging markets
Guinness sales rose by 4% in Ireland during the 12 months to June 30th - more than one in every three pints sold in Ireland come from the brand. Guinness brands hold a 34.6% market share in 'on-trade' sales in the country.
Diageo has attributed the growth to "continued successful innovations" from its Brewers Project. It spawned the Hop House 13 which accounts for 3% of overall lager sales in Ireland.
Worldwide Guinness sales increased by 4% - with the bulk of this growth coming from emerging markets. Sales of 'the black stuff' also rose in the UK - edging up by 1%.
Diageo reported double-digit growth in Ghana and Cameroon - and a 3% sales bounce in Nigeria.
Sales of the group's spirits fell by 1% in Ireland during the year. Gin sales bucked that trend - sales of its Tanqueray brand rose by 107% in volume, while Gordon's sales were up by 4%.
Liqueur sales rose by 3% during the 12 months - with Baileys sales increasing by 4% overall. The Irish liqueur enjoyed double-digit sales growth in the UK.
Ivan Menezes, Chief Executive, commented on the results: "This is a good set of results delivering what we set out to achieve this time last year and demonstrating our momentum.
"This better performance reflects the work we have done to strengthen our big brands through marketing and innovation, as well as expanding our distribution reach. Our six global brands and our US spirits business are all back in growth and we have seen a significant improvement in the performance of our scotch and beer portfolios," he said.