The Next Passport
Descent PathIrish Citizenship Through Your Grandparent
This page is informational, not legal advice. It describes Irish citizenship law in general terms, citing publicly available legislation and government sources. For guidance on your specific situation, consult a licensed Irish immigration solicitor. Irish law can change and Department of Foreign Affairs and Trade interpretations vary — the information below reflects publicly published law as of September 6, 2026 and may not reflect subsequent amendments.
Last verified: September 6, 2026 · Maintained by The Next Passport (Warner Creates LLC).
Who this route is for, in the Department's words
The Department of Foreign Affairs and Trade says: "If your grandparent was born on the island of Ireland, your parent was born outside Ireland, and you were born outside Ireland, you can apply for entry on to the Foreign Births Register."
It also says: "You are automatically an Irish citizen if one of your parents was an Irish citizen at the time of your birth, and was born on the island of Ireland. You don't need to apply to become an Irish citizen in this case." See the parent guide.
Not sure which describes your family? Take the free eligibility check.
Check your family's details
The free eligibility check asks where your parent and grandparent were born, and whether your grandparent was working abroad in the Irish public service when your parent was born.
Check your eligibility →Documents you'll need
The Department of Foreign Affairs and Trade lists the documents for each type of applicant on its Foreign Birth Registration page.
No apostille is needed on Irish-origin documents — and the Department of Foreign Affairs and Trade does not ask for one on US-issued records either. The Next Passport generates a personalized document checklist based on your specific lineage and tracks completion status for each item.
Northern Ireland grandparents
For NI-born grandparents, order birth certificates from GRONI (General Register Office for Northern Ireland) in Belfast, not the Republic's GRO. For grandparents born before 1922, all of Ireland was one jurisdiction — records may be held by either office depending on the county.
Check if you may qualify
The free eligibility check walks through the grandparent path. It takes about 2 minutes and does not require an account.
Check your eligibility →Ready to map out your specific application?
Start your free eligibility check →Not legal advice. This page describes Irish citizenship law in general terms based on publicly available legislation and government sources. Irish law can change and Department of Foreign Affairs interpretations vary. For guidance on your specific situation, consult a licensed Irish immigration solicitor.