Irish citizenship by descent: the rules we apply
A parent who was an Irish citizen born on the island of Ireland makes you Irish from birth, with nothing to register. A grandparent born there opens the Foreign Births Register, and you become Irish on the day you are entered in it.
Organiser, not legal advice. Rules change: confirm with the consulate or a lawyer. Read the current official page before you rely on any rule here: the Irish government's Foreign Births Register page.
Foreign Births Register through an Irish-born grandparent
Born abroad with a grandparent born on the island of Ireland: you become Irish once you are entered in the register. Documents are for three people: you, your parent in the line and the Irish-born grandparent. A great-grandparent does not qualify; a child born before the parent was entered in the register is not entitled through that parent.
Rules
- Born abroad with a grandparent born on the island of Ireland, or with a parent who was an Irish citizen (not born in Ireland) when you were born: you can become an Irish citizen through the Foreign Births Register. Source: Registering a foreign birth (Foreign Births Register), undated page, read 28 September 2026.
- If an expectant parent is not on the Foreign Births Register when the child is born, the child is not entitled to Irish citizenship through that parent: children born after the parent's entry can apply, children born before it cannot. So a great-grandparent does not qualify on the grandparent route; only if your parent was entered in the register before you were born can you register through that parent. Source: Registering a foreign birth (Foreign Births Register), undated page, read 28 September 2026.
- You are an Irish citizen once you are entered in the Foreign Births Register, and can then apply for a passport. Source: Registering a foreign birth (Foreign Births Register), undated page, read 28 September 2026.
- Originals of the civil birth certificate (showing parents) and civil marriage certificate or other name change document for you, your parent and your Irish-born grandparent; a certified copy of photo ID for your parent and grandparent, or a civil death certificate; for you, a certified copy of photo ID, two original proofs of address, four photographs and the signed, witnessed application. Source: Registering a foreign birth (Foreign Births Register), undated page, read 28 September 2026.
- Where the grandparent was born before Irish civil birth registration began in 1864, a baptismal certificate is accepted instead. Source: Registering a foreign birth (Foreign Births Register), undated page, read 28 September 2026.
- A certified copy or translation is signed and dated as a true copy or translation of the original by a recognised person or body: the issuing organisation, a solicitor or barrister, a notary, a commissioner for oaths or the post office service. They write that it is certified to be a true copy of the original seen by them, print their name, add their occupation, address and telephone number, and attach a stamp or seal, a business card or their professional register number. Source: Registering a foreign birth (Foreign Births Register), undated page, read 28 September 2026.
Documents the register asks for
| Document | For | Why |
|---|---|---|
| Birth certificate | Everyone in the chain | Original civil birth certificate showing parents. For a grandparent born before 1864, a baptismal certificate. |
| Marriage certificate | Everyone in the chain (when the chain records this event) | Original civil marriage certificate, or another name change document. |
| Name change record | Everyone in the chain (when the chain records this event) | Accepted in place of a marriage certificate to show a change of name. |
| Photo ID or death certificate | Each ancestor | Certified copy of photo ID if living, or the civil death certificate. |
| Photo ID (certified copy) | You | Certified copy of your photo ID, certified by your witness. |
| Proofs of address | You | Two separate original proofs of address. |
| Photographs | You | Four colour photographs, two of them witnessed. |
| Application form (official) | You | The completed, signed and witnessed online application. |
Apostille by default: no. Translation by default: no. You can switch either per document.
Automatic citizenship through a parent born in Ireland
If a parent was an Irish citizen born on the island of Ireland when you were born, you are Irish already and nothing is registered. The dossier is the proof for a first passport.
Rules
- If one of your parents was an Irish citizen born on the island of Ireland when you were born, you are already an Irish citizen and do not need to register. Source: Registering a foreign birth (Foreign Births Register), undated page, read 28 September 2026.
- Automatic citizens prove citizenship with a first passport application, usually with your birth certificate, your Irish-born parent's Irish birth certificate and ID. Treated as a working list. Source: Applying for a first Irish passport from abroad, not opened. Setting to confirm: Document list for the automatic route: working list. The passport application page was not opened in this pass. Check the current first-passport document list before ordering documents.
Documents the register asks for
| Document | For | Why |
|---|---|---|
| Birth certificate | Everyone in the chain | Your birth certificate naming the parent, and the parent's Irish birth certificate. |
| Marriage certificate | Everyone in the chain (when the chain records this event) | Explains a change of name between the records. |
| Photo ID or death certificate | Your parent in the line | The parent's ID if living, or the death certificate. |
| Photo ID (certified copy) | You | Your own identity document. |
Apostille by default: no. Translation by default: no. You can switch either per document.
Start your dossier
Pick your country and route, add the people in your line, and the register lists every document the route asks for, with the rule behind each one. Free for one case. Your family's records stay in this browser.
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