Yes. The rule says the island of Ireland, not the Republic of Ireland, so a grandparent born in Northern Ireland counts.
A grandparent born in Belfast or Derry counts the same as one born in Cork or Galway.
Watch: Do You Qualify for an Irish Passport?
The video starts at the part that answers this question. For the whole picture, read Irish Passport Through a Grandparent: Do You Qualify?
Subscribe to Love Ireland on YouTube for a new plain-English guide to Ireland every week. The full video is on YouTube: Do You Qualify for an Irish Passport? The Grandparent Rule Explained.
What “the island of Ireland” means
This is a point many people miss. The rule covers the whole island, north and south. All 32 counties.
So when you read the official wording, do not swap in “the Republic” in your head. The place that matters is the island.
The grandparent rule in plain words
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Say your grandparent was born on the island of Ireland, your parent was born outside Ireland, and so were you. Then you can apply to be entered on the Foreign Births Register.
Once you are on that register, you are an Irish citizen, and you are entitled to apply for an Irish passport.
With an Irish-born grandparent, you are not a citizen yet. You have the right to become one, and registration is the step that makes it real.
Which grandparent counts?
- It can be any one of your grandparents.
- The line can run through your mother or through your father.
- Your parents do not need to have Irish passports.
- Your grandparent does not need to be living. If they have passed away, you send their death certificate in place of their photo identification.
The Department of Foreign Affairs says any person with a grandparent born on the island of Ireland can apply.
What you have to show
What matters is the paper trail, from your grandparent, to your parent, to you.
- Your grandparent was born on the island of Ireland.
- Your parent is their child.
- You are your parent’s child.
- You have certificates that prove each link.
If it was you or your parent who was born there
The same island rule applies closer to home.
If you were born on the island of Ireland before 1 January 2005, you are entitled to be an Irish citizen. For births from that date on, it depends on your parents’ citizenship, their residence rights, and how long they had lived there.
And suppose your mother or your father was born on the island of Ireland, and was an Irish citizen when you were born. Then you are already an Irish citizen, automatically. You do not need to register anything. You can apply for your Irish passport directly.
One note on Northern Ireland records
Ireland’s civil registration service has births registered in what is now Northern Ireland from 1864 through 1921, and for later births you are sent to the General Register Office for Northern Ireland.
General information, not legal advice. Facts checked against official Irish government pages on 6 October 2026.
Official sources
- Department of Foreign Affairs: Registering a foreign birth
- Department of Foreign Affairs: Born abroad
- Department of Foreign Affairs: Born in Ireland
- Citizens Information: Irish citizenship through birth or descent
- Irish Nationality and Citizenship Act 2001
- HSE: Order an Irish birth certificate
Subscribe to Love Ireland on YouTube for a new plain-English guide to Ireland every week. The full video is on YouTube: Do You Qualify for an Irish Passport? The Grandparent Rule Explained.
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