The Government has approved the deployment of 440 Irish troops to Lebanon.
They are expected to serve with the United Nations Interim Force in Lebanon (UNIFIL) from the second quarter of 2011.
Minister for Defence Tony Killeen is to seek Dáil approval for the mission in the new year.
Irish troops previously served in Lebanon for nearly a quarter of a century until their withdrawal in 2001. In October 2006, 150 Irish soldiers served in Lebanon on peacekeeping duties following a month-long war between Israel and Hezbollah in July of that year.
Minister Killeen said: 'It is vitally important for Ireland to maintain a level of commitment to international peacekeeping operations and the obligations it has assumed through its membership of the UN.
'Overseas operations contribute greatly also to the professional development of the Defence Forces
'Savings being achieved through the drawdown of troops from other overseas missions will partially offset the cost of Ireland's participation in UNIFIL, most of which will be met by the UN.'
Lt Gen Sean McCann said he was delighted with the announcement.
He said: 'We have a long and proud tradition of service in the Lebanon and we look forward to using our skills and our experience to make a substantial contribution to the peace and security of the region.'
Fine Gael Defence Spokesperson David Stanton also welcomed the deployment.
Mr Stanton said: 'The Defence Forces have provided outstanding service for many years in Lebanon and while it is sad that another troop deployment is required, I have no doubt but that they will continue to maintain their high standards in fulfilling their UNIFIL duties.'
