Irish Citizenship by Descent
Irish citizenship can be claimed by descent through parents or grandparents born on the island of Ireland. The process involves registering with the Foreign Births Register (FBR), which extends Irish citizenship to those whose connection is through a grandparent.
Current passport design
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Eligibility Overview
If either of your parents was an Irish citizen at the time of your birth, you are automatically an Irish citizen—you simply need to apply for a passport as proof. If your parent was not born in Ireland but became a citizen through the Foreign Births Register before your birth, you are also a citizen. If your grandparent was born in Ireland but your parent was not, you can register in the FBR to become a citizen yourself. However, great-grandparent connections do not qualify unless your parent registered before your birth.
Key Requirements
- ✓At least one grandparent born on the island of Ireland (Republic or Northern Ireland)
- ✓Parent must have registered in FBR before your birth for great-grandparent claims
- ✓Proof of identity and relationship to Irish ancestor
- ✓No criminal disqualifications
Documents You Will Need
- 1Your full birth certificate
- 2Your parents' birth and marriage certificates
- 3Your Irish grandparent's birth certificate
- 4Your grandparents' marriage certificate
- 5Photographic ID (passport or driver's license)
- 6Proof of address
- 7Completed FBR application form
Expected Timeline
Foreign Births Register applications currently take approximately 12-18 months to process due to high demand. Passport applications for those already recognized as citizens are much faster, typically 4-8 weeks.
Common Pitfalls to Avoid
- ⚠️Great-grandparent claims only work if parent registered before your birth
- ⚠️Northern Ireland births count—don't assume they don't
- ⚠️Name changes require additional legal documentation
- ⚠️Adopted persons have specific additional requirements
- ⚠️Processing times have increased significantly in recent years
Official Resources
Frequently Asked Questions
Who can qualify for Irish Citizenship by Descent?
You automatically qualify if a parent was an Irish citizen at your birth. If your grandparent was born in Ireland but your parent was not, you can register in the Foreign Births Register to claim citizenship. Great-grandparent claims only work if your parent registered before you were born, creating an unbroken chain.
Which documents are required?
You need your birth certificate, your parents' birth and marriage certificates, your Irish grandparent's birth certificate, and your grandparents' marriage certificate. All documents must be original or certified copies. Foreign documents may require apostilles.
How long does the process take?
Foreign Births Register applications currently take 12-18 months. Once registered, passport applications take 4-8 weeks for standard processing.
Legal Basis
The Irish Nationality and Citizenship Act 1956 (as amended) is the primary legislation. The Foreign Births Register was established under the Irish Nationality and Citizenship Act 1986. Section 7 of the 1956 Act governs citizenship by birth to an Irish parent; Section 8 governs citizenship through the FBR for grandchildren.
Dual Citizenship
Ireland permits dual citizenship without restriction. You do not need to renounce your existing nationality to become Irish, and Ireland will not require you to give up Irish citizenship if you later acquire another. Over 700,000 people hold Irish passports alongside another nationality.
Estimated Costs
FBR application fee: €278 (as of 2025). Certified document copies: €50–€150. Apostilles where required: €20–€40 per document. Irish passport fee after registration: €80 (standard). Total out-of-pocket for a typical grandparent claim: €500–€900 without a solicitor.
Key Archives for Research
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Start the CheckerHow Does the Foreign Births Register Work?
If your Irish heritage comes through a grandparent (rather than a parent), you need to register in the Foreign Births Register before you can get an Irish passport. Your parent may also need to register first. See the full guide for eligibility tiers, the online application process, and current fees.
Full Guide: Ireland Foreign Births Register →