To be eligible for Irish dual citizenship, you must meet one of these fundamental requirements:Class 1: You were born in the island of Ireland on or before 31 December 2004.Class 2: If you were born on the island of Ireland on or after 1 January 2005. You can be entitled to Irish citizenship if one or both of your parents is either Irish or British, or entitled to live in Northern Ireland or the Irish State without restriction. You can also be entitled to Irish citizenship if they are a foreign national but have been legally residing in Ireland for at least 3 out of 4 years immediately prior to your birth date.Class 3: You are a child of Class 1 but you were born outside of Ireland.Class 4: You are a child of Class 3 and a grandchild of Class 1 born outside of Ireland.Class 5: You are a child or Class 4 and a great grandchild of Class 1 born outside of Ireland.If you want to learn more about how to become an Irish citizen, there is also an option for you to apply for Irish citizenship through a great grandparent.Furthermore, you may qualify for the republic of Ireland dual citizenship if you are currently married an Irish citizen.