Irish Citizenship — Born on island of Ireland pre-2005

Summary

Until 1 January 2005, Ireland applied broad citizenship by birth on the island of Ireland. Anyone born on the island of Ireland, including Northern Ireland, before that date is entitled to be an Irish citizen, regardless of their parents' nationality or immigration status.

On 1 January 2005, the 27th Amendment of the Constitution and the Irish Nationality and Citizenship Act 2004 ended unrestricted jus soli. From that date forward, a child born in Ireland is only automatically Irish if at least one parent is an Irish citizen, a British citizen, a settled resident, or otherwise has a qualifying link. But the change was prospective only — it did not strip citizenship from anyone who had already acquired it by birth.

If you were born anywhere on the island of Ireland before 1 January 2005, you are already an Irish citizen. You may simply have never documented the status with an Irish passport or Foreign Birth Register entry.

Eligibility

You are already an Irish citizen if both of the following are true:

• You were born on the island of Ireland (the Republic of Ireland or Northern Ireland, which for nationality purposes has always been jus soli territory under Irish law).
• You were born before 1 January 2005.

If you were born in Northern Ireland, you have the right to identify as, and hold a passport of, Irish, British, or both — a principle protected by the Good Friday Agreement. Claiming Irish citizenship does not require you to renounce British citizenship.

What This Route Allows

This route can help confirm or document citizenship in Ireland when the citizenship-creating facts named above are proven. For many people in this category, the main work is evidence: civil records, family-link records, prior citizenship records, and any registration or restoration paperwork needed to show the claim.

What This Route Is Not

This is not a shortcut around documentation. Even when the citizenship claim is based on a right, you still need records that prove each required fact and family link.

Next Steps

1. Locate your Irish (or Northern Irish) birth certificate. A long-form civil birth certificate is the primary evidence. Order a certified copy from the General Register Office (GRO) for births registered in the Republic, or the General Register Office of Northern Ireland (GRONI) for births in Northern Ireland.
2. Apply for your first Irish passport. A long-form Irish or Northern Irish birth certificate dated before 1 January 2005 is accepted as straightforward proof of Irish citizenship. First-time adult passports apply via Passport Online or the AP1 paper form at around €75 (standard 10-year book) plus postage.
3. If your parents were neither Irish nor British and you were born in the Republic on or after 1 January 2005, this pathway does not apply — check whether your parents were legally resident in Ireland for the qualifying period, or look at descent routes via an Irish-citizen parent or grandparent.
4. Dual citizenship is permitted. Ireland places no restrictions on holding additional nationalities, so claiming Irish citizenship does not affect any other citizenship you hold.

Sources

• Irish Nationality and Citizenship Act 1956, as amended — the primary nationality statute, including the 2004 amendments that ended unrestricted jus soli.
• 27th Amendment of the Constitution Act 2004 — the constitutional change that enabled the statutory restriction.
• Department of Foreign Affairs — Born in Ireland — official citizenship-by-birth guidance.
• Department of Foreign Affairs — Irish passport — first-time and renewal application portal.
• Department of Justice — Becoming an Irish citizen — overview of citizenship routes and eligibility.