Irish Distillers have announced a €100m investment at its plant at Midleton in Co Cork and the creation of 60 new jobs in Cork and Dublin.
The company says expansion of the distillery is necessary to meet increasing demands for its Jameson whiskey worldwide.
A total of 3.4 million cases of Jameson were sold worldwide in the year to the end of June 2011. The whiskey brand is in its 23rd consecutive year of growth and is seeing double-digit growth in 40 markets, the company says.
30 permanent jobs will be created at the company's plant in Midleton, while another 30 will be created at the company's bottling plant at Fox and Geese in Dublin. Irish Distillers, which is owned by drinks giant Pernod Ricard, will now employ a total of 560 people.
About 250 people will be employed during the 15 month construction period, with work due to begin on site next year, subject to planning permission.