Genie·Origin

Irish citizenship by descent, in plain English

Many people born outside Ireland can become Irish citizens through a parent or grandparent. Here is how it works, in everyday words.

Please remember: we are an independent website, not the government. Only the Department of Foreign Affairs can decide your case. Fees, waiting times and rules change, so always check the official Foreign Births Register page on ireland.ie.

The main routes

1. A parent born on the island of Ireland

If one of your parents was born on the island of Ireland and was an Irish citizen when you were born, you are usually already an Irish citizen. You don’t normally need the Foreign Births Register – you can usually apply for an Irish passport directly.

If your parent was born in Ireland on or after 1 January 2005. People born on the island of Ireland on or after that date are not automatically Irish citizens – it depends on their own parents’ citizenship and residence at the time. So a parent born in Ireland after 2005 doesn’t guarantee this route. Please check the official Born in Ireland page on ireland.ie first.

2. A grandparent born on the island of Ireland

If you were born abroad and one of your grandparents was born on the island of Ireland, you can usually apply to be entered on the Foreign Births Register. You become a citizen on the day you are registered – not before. A passport is a separate application afterwards.

3. A parent who was already a citizen when you were born

If your parent was born outside Ireland but was already an Irish citizen on the day you were born (for example, they were on the Foreign Births Register, or had been naturalised), you can usually register too.

The timing rule people often miss. Your parent must have been a citizen at the time of your birth. If your parent registers now, after you were born, that usually won’t help you – though it may help children born to you after you register.

What about Northern Ireland?

The rules talk about being born on the island of Ireland, which includes Northern Ireland. A grandparent born in Belfast or Derry counts in the same way as one born in Cork. The birth record is just held in a different place – see our Northern Ireland births guide.

Great-grandparents

A great-grandparent on their own is usually not enough. It only works if your parent was entered on the Foreign Births Register (through their Irish-born grandparent) before you were born. The official page says children born before a parent’s registration are not eligible, because the parent wasn’t a citizen at the time of their birth.

Adoption

If you, or anyone in the line, was adopted, the route depends on where, when and under which law the adoption happened. Please read the official page on ireland.ie, which has separate document lists for adoption cases, and talk to a solicitor before applying.

Where might I fit?

Answer a few questions to see which route you appear to fall under. It takes about a minute. Nothing is sent or saved – it all happens on your screen.

Documents people usually need

In general terms, applicants gather official birth, marriage and sometimes death certificates linking them, step by step, to their Irish-born parent or grandparent, plus identity documents and photos, and a witness. The exact list depends on your route, so please use the official document list on ireland.ie.

  • The Irish-born ancestor’s birth certificate (a civil certificate, or in some cases a baptism record – check the official guidance).
  • Marriage and birth certificates for each generation between you and them.
  • Proof of your identity and address.

Names and dates often don’t match perfectly across old documents. Our guide to name and spelling mismatches explains why.

We will never ask for your passport number, PPS number, any ID number, or copies of your documents. Please don’t send them to us.

Fees and waiting times

There is an official application fee, and applications have been taking many months. Because these change, we don’t repeat them here – the official page on ireland.ie always has the current figures. Nobody outside the Department can speed up an application, and we will never offer to submit one for you.

When to get professional help

Please talk to a professional genealogist or a solicitor if your case involves adoption, parents who weren’t married, an Irish-born grandparent with no birth record you can find, documents that conflict, or a deadline such as a baby on the way.