Ireland: Citizenship by Descent

Irish citizenship passes by bloodline through either parent. The mechanism is different depending on the generation:

• –Parent born in Ireland: Automatic entitlement; apply directly for passport
• –Grandparent born in Ireland: Eligible via Foreign Births Register (FBR), no pre-registration required
• –Great-grandparent born in Ireland: Eligible ONLY if the intermediate parent (grandparent's child = applicant's parent) was registered on the FBR before the applicant was born
• –Beyond great-grandparent: Each generation in the chain must have registered on the FBR before the next person was born. Missing any generation permanently breaks the chain.

The FBR break is timing-based, not citizenship-loss-based. An ancestor can have been fully Irish their whole life, but if they didn't register on the FBR before their child was born, the chain is broken for that generation.

• –FBR registration is forward-looking only. Registration on the FBR takes effect from the date of registration, not retroactively from birth. A grandparent who registered after your parent was born does not establish eligibility for you.
• –Pre-1956 female ancestor: Before the Irish Nationality and Citizenship Act 1956, an Irish woman who married a foreign national could lose her Irish citizenship. If your line runs through a female ancestor who married a non-Irish person before 1956, verify she retained citizenship at the time her child was born.
• –Northern Ireland counts. The island of Ireland provision includes Northern Ireland (part of the UK). A grandparent born in Belfast or Derry qualifies the same as one born in Dublin or Cork.
• –Processing time: As of 2025, FBR processing takes approximately 9 to 10 months. Fee: €278 adults / €153 children.

• –Irish ancestor's birth certificate (showing birth on island of Ireland)
• –Marriage certificates linking each generation
• –Applicant's own birth certificate
• –If claiming through great-grandparent: proof that intermediate parent was registered on FBR

1. 1.Locate birth, marriage, and death records for all ancestors in the chain
2. 2.If claiming through grandparent: gather grandparent's Irish birth certificate and your own birth certificate
3. 3.Register on the Foreign Births Register via the nearest Irish consulate
4. 4.Processing fee: €278 (adults) / €153 (children)
5. 5.Expected timeline: 9 to 10 months