Does Ireland allow dual citizenship with the USA?

Yes. Ireland lets you hold Irish citizenship alongside US citizenship, and you don’t give anything up by claiming through a parent or grandparent. Ireland’s Immigration Service says you may become an Irish citizen and remain a citizen of another country, and that Irish law doesn’t make you give up Irish citizenship to take another. People who are Irish by birth, descent or the Foreign Births Register have no loss rule to worry about. Two details are often missed. From 1935 to 1956 the law ended the citizenship of adults who took another nationality. And the 1956 Act still lets the Minister revoke citizenship from naturalised Irish citizens who voluntarily acquire another one.

The short answer

• American claiming through an Irish-born parent: you are normally Irish already, and you hold both citizenships.
• American claiming through an Irish-born grandparent: you keep US citizenship and become Irish from the date of your Foreign Births Register entry.
• Irish citizen by birth or descent who becomes American: stays Irish.
• Naturalised Irish citizen who voluntarily takes another citizenship: the Minister has a power to revoke, under section 19(1)(e).
• American naturalising in Ireland: no need to give up US citizenship.
• Someone from Northern Ireland: entitlement to Irish citizenship sits alongside British citizenship.

How Ireland got here

Article 9 of the Constitution leaves the acquisition and loss of citizenship to ordinary law, and it also calls fidelity to the nation and loyalty to the State fundamental political duties of all citizens. It doesn’t mention dual citizenship. The rule comes from statute, and the statute changed.

• The 1935 Act: loss on taking another citizenship. Under section 21(1), a citizen who became a citizen of another country after turning 21 ceased to be a citizen of Saorstát Éireann. Under section 21(2), a natural-born citizen who was also a foreign citizen from birth or childhood could drop Irish citizenship by a declaration of alienage within a year of turning 21.
• 17 July 1956: the current Act. The Irish Nationality and Citizenship Act 1956 repealed the 1935 Act, kept existing citizens as citizens, and said every person born in Ireland is an Irish citizen from birth. It has no general rule ending the citizenship of someone who takes a foreign one.
• Section 24: automatic foreign citizenship. The 1956 Act added that nobody is to be treated as ever having lost Irish citizenship under the 1935 Act merely because another country’s law gave them citizenship without any voluntary act.
• 1 July 1986: renunciation and the register. The current wording of section 21 dates from this day. Section 7 also says the citizenship of someone registered on the Foreign Births Register after 1 July 1986 starts only from the registration.
• 2 December 1999 and 1 January 2005: birth on the island. The 2001 Act rewrote sections 6 and 7 around the “island of Ireland”, and the 2004 Act, following the change to Article 9, limited citizenship by birth for some children of non-nationals born from 2005.
• 7 April 2025: a new revocation process. In Damache (2021) the Supreme Court struck down the earlier revocation procedure, and the 2024 Act put new steps into section 19.

The 1935 to 1956 gap

This is the period where old dual citizenship rules can touch a family history. Picture an Irish-born adult who took US citizenship by application while the 1935 Act was in force. Section 21(1) ended their citizenship. Section 24 of the 1956 Act only protects people who gained foreign citizenship with no voluntary act, so it doesn’t obviously help them.

But the 1956 Act as enacted said in section 6(1) that every person born in Ireland is an Irish citizen from birth, and it didn’t carve out people who had lost citizenship under the old law. Today’s section 7(1) also covers a parent who “would if alive have been” an Irish citizen. The Department of Foreign Affairs words its grandparent rule around birth on the island, not around later naturalisation. We found no official statement that deals with this exact case, so don’t treat the point as settled. If your ancestor naturalised abroad in those years, mention it to the Foreign Births Register team rather than assuming either way.

How Irish citizenship can be lost today

Citizens by birth, descent or registration

Part IV of the Act is headed “Loss of Citizenship”. For these citizens, it offers one route, which is your own choice.

• Declaration of alienage (section 21). You must be of full age, ordinarily resident outside the State, and be or be about to become a citizen of another country. The Department of Foreign Affairs says you complete Form 13, have it witnessed and send it to Immigration Service Delivery. You stop being Irish when it’s lodged, or when you gain the other citizenship if that comes later. In wartime you need the Minister’s consent.

Sections 22 and 23 close off the rest. Losing citizenship doesn’t of itself affect your spouse, civil partner or children, and marrying a non-national doesn’t end your citizenship.

Naturalised citizens

Section 19 applies to certificates of naturalisation, not to citizens by birth or descent. The Minister may revoke a certificate if satisfied of any of these grounds:

• it was obtained by fraud, misrepresentation (even innocent) or concealment;
• the person has, by an overt act, failed in their duty of fidelity to the nation and loyalty to the State;
• they have lived outside the State for seven continuous years, not in the public service, without reasonable excuse for not registering their intention to keep citizenship each year. This one excludes certificates issued to people of Irish descent or associations;
• they are also a citizen, under its law, of a country at war with the State;
• they have acquired another citizenship by any voluntary act other than marriage or a civil partnership.

That last ground has been in the Act since 1956. It sits awkwardly with the Immigration Service’s general statement that you don’t have to give up Irish citizenship to take another. We found no official statement on how often it’s used, or on whether it’s used at all against people who simply naturalise elsewhere. But it hasn’t been repealed, and the 2026 General Scheme leaves it in place. A later citizenship of choice is the risk: the Immigration Service says you can naturalise in Ireland without giving up the citizenship you already have.

The power isn’t automatic. The Minister must give notice with reasons, you have 28 days to make representations, and after a decision you have 14 days to ask for an inquiry. Citizens Information describes this as a Committee of Inquiry that can affirm or reject the decision.

What descendants claiming by descent need to know

Your US citizenship plays no part in any of these routes. What matters is where your family was born and when each person became Irish.

1. Irish-born parent. If a parent was an Irish citizen when you were born and was born on the island of Ireland, the Department of Foreign Affairs says you are automatically Irish and don’t need to apply. Our Irish passport guide covers the next steps.
2. Irish-born grandparent. If your parent and you were born abroad, you apply to the Foreign Births Register. Section 7 doesn’t make you a citizen until your birth is registered, and that citizenship runs from the registration date. The Department currently estimates about 12 months.
3. Parent registered in time. If your parent was an Irish citizen when you were born, even though born abroad, you can register too. The Department warns that if an expectant parent isn’t on the register when the child is born, the child won’t be entitled. See Irish citizenship through great-grandparents.
4. Irish descent or associations. Section 16 lets the Minister, in his absolute discretion, naturalise someone of Irish descent or associations without the usual conditions. This is the one descent-linked route that gives you a certificate of naturalisation, so section 19, including the voluntary acquisition ground, then applies to you. Only the seven-year ground excludes these certificates.

One word of caution on section 6(2): people born on the island are entitled to be Irish citizens, and they are citizens from birth if they do something only a citizen can do, such as applying for an Irish passport. Not having done so isn’t itself evidence that they aren’t Irish. That is why many people in Northern Ireland hold Irish and British citizenship at the same time. Children born on the island from 1 January 2005 may depend on a parent’s citizenship or residence under section 6A.

If you renounced, or a parent did

Section 6(5) says someone born on the island of Ireland who made a declaration of alienage stays entitled to be a citizen, and becomes one again by a declaration, with effect from that date. Someone who renounced after claiming through the Foreign Births Register has no equivalent right in section 6(5), because it’s limited to people born on the island. The Immigration Service says only that former citizens can apply to reacquire citizenship “under some circumstances”.

A later declaration doesn’t reach back. A child born while the parent had renounced is in the same place as any child whose parent wasn’t a citizen at the birth, which is why section 7’s timing rule matters.

Living in Ireland as a dual citizen

• Stamp 6. If you hold Irish and another citizenship, you can ask for a Without Condition endorsement in your non-Irish passport. You must hold or have the right to hold an Irish passport, and there’s no fee or form. The Immigration Service is warning of processing delays.
• Naturalising in Ireland. An American can apply under section 15 without giving up US citizenship. The conditions include one year’s continuous residence plus four years’ residence in the previous eight, and a declaration of fidelity to the nation and loyalty to the State. The application is decided at the Minister’s absolute discretion.

Pending: the 2026 citizenship bill

On 9 September 2026 the Government approved priority drafting of the Irish Nationality and Citizenship (Amendment) Bill 2026. The General Scheme was published on 21 September 2026 and is to go to the Joint Committee on Justice for pre-legislative scrutiny. It’s listed in the Autumn 2026 legislation programme. A General Scheme is a plan, not a Bill, and none of this was law on 6 November 2026.

• Naturalisation (Heads 5 to 7). Residence would rise from five to eight years for most applicants, with language and civics tests and a self-sufficiency requirement.
• Revocation (Head 10). A new section 19(1)(f) would let the Minister revoke a certificate of naturalisation in the interests of public policy, public order or national security. The voluntary acquisition ground in section 19(1)(e) stays.
• Section 16 (Head 8). The good character condition could no longer be waived for any applicant. That would reach people applying on grounds of Irish descent or associations.
• What it leaves alone. Its ten heads don’t amend section 6, section 7, section 21 or section 27, and the only change near citizenship at birth concerns how residence is counted under section 6B. Nothing in it asks anyone to give up another citizenship. Foreign Births Register claims through a parent or grandparent aren’t affected by the scheme as published.

The US side

The US Mission in Ireland says the US recognises and permits other nationalities, while noting the problems they can cause and not encouraging them. It reminds dual nationals of two duties. By law, under 8 U.S.C. 1185(b), a US citizen must enter and leave the United States on a valid US passport, which makes you ineligible for a visa or the Visa Waiver Program. And you must keep filing US tax returns.

The Foreign Affairs Manual adds that Americans who naturalise abroad don’t automatically lose US citizenship and that intent to keep it is presumed. Under 8 U.S.C. 1481, loss needs a voluntary act done with the intention of giving up US nationality. Ireland’s own warning runs the same way for other countries: the Immigration Service tells applicants to check with their other country, because some end citizenship automatically when you acquire another. See European citizenship by descent for Americans.

Practical steps

1. Work out your route. Find the birth place and citizenship of your parents and grandparents, and whether anyone was already on the Foreign Births Register. Our document chain guide covers the paperwork.
2. Note any naturalisation before 17 July 1956. Our guide to USCIS naturalisation records shows how to find the date.
3. Register before you have children, if you’re claiming through a grandparent. A child born before your registration won’t be entitled through you.
4. If you’re naturalised and planning to take another citizenship, ask the Immigration Service in writing about section 19(1)(e) first.
5. Don’t file a declaration of alienage lightly, especially if you were born outside the island.
6. Watch for the 2026 Bill, if you’re applying for naturalisation or live in Ireland.

To check whether you have a claim, use our free citizenship by descent checker. For other countries, see dual citizenship by descent, country by country.

Frequently asked questions

Official sources

• Law Reform Commission: Irish Nationality and Citizenship Act 1956, Revised Act (updated to 12 June 2026; sections 6, 7, 15, 16, 19, 21 to 24 and 27, with their amendment notes)
• Irish Statute Book: the 1956 Act as enacted (sections 5, 6, 19 and 24) and the 1935 Act as enacted (section 21)
• Constitution of Ireland (Article 9)
• Immigration Service Delivery: Dual citizenship and Without Condition (Stamp 6)
• Department of Foreign Affairs: Registering a foreign birth and Renouncing your citizenship
• Citizens Information: Entitlement to Irish citizenship (renunciation, revocation, Committee of Inquiry)
• Department of Justice: General Scheme of the 2026 Bill, its full text (PDF), the Government press release and the Autumn 2026 legislation programme (PDF)
• US Mission Ireland: Dual Nationality, with 7 FAM 080 and 8 U.S.C. 1481

Checked against these sources on 6 November 2026, when no Bill had been published from the General Scheme. The Revised Act is an administrative consolidation, not an official text, so older wording was also read in the enacted Acts. The State Department’s public dual nationality page refused automated access that day. Only the Department of Foreign Affairs, the Minister for Justice and the Irish courts can decide your case; confirm with them before you act.