Does the UK Allow Dual Nationality?
Yes. Dual nationality in the UK is permitted, meaning a person can be a British citizen while also holding the citizenship of another country. UK law does not generally require someone to give up an existing nationality when becoming British, nor does becoming a citizen of another country normally cause a British citizen to lose their British citizenship.
There is also no general legal limit on the number of nationalities a British citizen can hold. Someone could therefore potentially hold British citizenship alongside two or more other nationalities, provided the laws of the other countries involved allow this.
The important distinction is that the UK dual citizenship rules only determine the position under British law. Other countries can take a very different approach. Some prohibit dual nationality, some permit it only in particular circumstances, and others may regard citizenship as automatically lost when another nationality is acquired.
Anyone considering becoming a British citizen should therefore check the nationality laws of every other country concerned before applying.
UK Law on Dual and Multiple Nationality
The legal framework
The UK has allowed dual nationality for many decades. The British Nationality Act 1948, which came into force on 1st January 1949, established a nationality framework under which holding another citizenship did not automatically result in the loss of British nationality.
The British Nationality Act 1981 subsequently reorganised British nationality law and created the modern status of British citizenship from 1st January 1983. There is no general prohibition in that legislation preventing a British citizen from simultaneously holding another nationality.
As a result, British dual nationality can arise in several different ways. Acquiring British citizenship will not, from the UK's perspective, require an applicant to surrender another citizenship. Equally, a British citizen who later acquires another country's citizenship does not ordinarily lose British citizenship simply by doing so.
The position under multiple citizenship UK law must, however, be considered separately from the law of the other country concerned.
Common scenarios
Dual or multiple nationality can arise where:
- a person acquires more than one nationality automatically at birth through their parents or place of birth;
- someone obtains British citizenship by naturalisation but retains their previous nationality; or
- an existing British citizen later acquires citizenship of another country.
Being born in the UK does not itself always make someone British. Whether a UK-born child is automatically British will depend on factors including their date of birth and their parents' status at the time.
Further information on the different British nationality routes is available in our British Nationality guide.
Travel Rules for Dual Nationals
Holding two passports can make international travel easier in some circumstances, but dual nationals need to be particularly careful about which document they use.
Entering the UK as a dual national
An important change took effect on 25th February 2026 when the UK began fully enforcing its Electronic Travel Authorisation system for non-visa nationals.
British citizens, including British dual nationals, cannot obtain an ETA. A British dual national travelling to the UK should therefore normally demonstrate their entitlement to travel using:
- a valid British passport;
- a valid Irish passport, where they are also an Irish citizen; or
- another valid passport containing a Certificate of Entitlement confirming the right of abode in the UK.
This is particularly important because airlines and other carriers check passengers' permission to travel before boarding. A British citizen attempting to travel solely on a foreign passport may otherwise appear to require an ETA even though, as a British citizen, they are not eligible for one.
There are limited exceptions in current guidance. For example, some people who became British after obtaining status under the EU Settlement Scheme may be able to travel using their other qualifying passport or national identity card where their relevant status remains accessible through their UKVI account.
These dual passport travel rules mean that British citizens should check their documentation well before travelling rather than assuming that a foreign passport will be sufficient.
Travelling to other countries
The rules for your destination country must also be checked.
Some countries require their own citizens to enter and leave using that country's passport, even where they also hold British citizenship. Airlines may additionally request evidence that you have permission to enter your destination or return to the UK.
Dual nationals should therefore check the entry and exit requirements applying to each nationality before travelling.
Rights and Limitations of Dual Nationality
Rights as a dual national
A British citizen who also holds another nationality retains the same fundamental rights associated with British citizenship.
These include an unrestricted right to live and work in the UK and eligibility to apply for a British passport. British citizens can also vote in UK elections subject to the applicable electoral registration and voting rules.
British citizenship may also be passed to children in certain circumstances. Whether a child automatically becomes British depends on matters including where the child and parent were born, how the parent acquired British citizenship and, in some situations, whether registration is required.
A dual national may simultaneously have rights arising from their other citizenship, although those rights are determined by the law of that country.
Limitations to be aware of
There are several important dual nationality rights and restrictions to consider.
One of the most significant concerns consular protection. The British government will not normally be able to provide diplomatic assistance to a British dual national while they are in the country of their other nationality, because that country may treat them exclusively as its own citizen.
Dual nationality can also create additional considerations involving:
- tax residence, income or reporting obligations in another country;
- compulsory military or national service;
- inheritance and property ownership rules; and
- nationality or residency requirements for certain security-sensitive employment.
Tax liability should not be assumed to arise simply because someone has dual nationality. Rules differ considerably between countries and can depend on residence, domicile, source of income and, in some jurisdictions, citizenship itself. Specialist tax advice should be taken where necessary.
Countries That Do Not Allow Dual Nationality
Although British law permits dual nationality, this does not mean the other country involved will do the same.
Examples of countries with significant restrictions include India, China, Singapore and Japan. Current UK government guidance states that India, China and Japan do not recognise dual citizenship, while Singapore generally does not recognise it. The precise consequences and exceptions can differ considerably between countries.
Some jurisdictions may automatically withdraw a person's citizenship when they voluntarily acquire another nationality. Others may permit dual nationality where it arose automatically at birth but impose restrictions when a person later naturalises elsewhere.
Rules can also change.
For this reason, anyone considering British citizenship by naturalisation should contact the embassy, high commission or consulate of their existing country of nationality before applying. They should establish whether becoming British would cause their existing citizenship to be lost, whether formal renunciation is required and what consequences this could have.
Where another country requires a person to renounce citizenship, the UK does not itself require an existing foreign nationality to be surrendered. The requirement comes from the other country's law.
Renouncing British Citizenship
A person can voluntarily renounce British citizenship if they meet the relevant statutory requirements.
Renunciation is governed principally by section 12 of the British Nationality Act 1981. An applicant must ordinarily already hold another nationality or be due to acquire another nationality after renouncing British citizenship. This protection is intended to avoid making a person stateless.
Applications are made through the formal renunciation process and a fee applies. If accepted, the applicant receives a declaration of renunciation confirming that they are no longer British.
Renunciation can have significant consequences. In particular, the person will no longer have the automatic right to live in the UK by virtue of British citizenship and may require immigration permission to do so.
Section 13 of the British Nationality Act 1981 provides a once-only entitlement to resume British citizenship in certain circumstances where a person previously renounced it because doing so was necessary to retain or acquire another nationality.
Where renunciation took place for another reason, resumption may instead be discretionary.
Anyone considering renunciation should therefore obtain advice on both their British nationality position and the consequences under the law of their other country before proceeding.
Frequently Asked Questions
- Can I hold more than two passports as a British citizen?
- Do I need to tell the UK government about my other nationality?
- Will having dual nationality affect my ILR or citizenship application?
- Can my children hold dual nationality?
- Do I have to enter the UK on my British passport?
- Can I renounce my British citizenship and get it back later?
- [Book a consultation]
Potentially, yes. The UK does not impose a general limit on the number of nationalities a British citizen can hold. Whether you can retain three or more citizenships will depend on the nationality laws of every other country involved.
Holding several nationalities should also be distinguished from holding several passports. Each country determines whether and when it will issue a passport to its citizens.
There is no general process requiring every British citizen to separately register another nationality simply because they acquire it.
However, information about your other nationality may need to be disclosed when completing passport, nationality, immigration, security clearance or other government applications where the relevant form asks for it.
Holding another nationality does not itself prevent someone from obtaining Indefinite Leave to Remain or British citizenship.
For a citizenship application, however, the applicant must independently satisfy the relevant statutory requirements, including requirements relating to immigration status, residence and good character where applicable.
Applicants should also check whether their existing country of nationality will allow them to retain that citizenship after becoming British.
Yes, potentially. Children frequently acquire more than one nationality automatically through their parents or circumstances of birth.
Whether a child is British and whether they also acquire or retain another nationality will depend on the laws of each country involved.
Being born in the UK does not automatically make every child a British citizen, so the child's individual circumstances should be checked.
Since enforcement of the ETA system from 25 February 2026, British dual nationals should generally travel to the UK using a valid British passport, a valid Irish passport where applicable, or another passport containing a Certificate of Entitlement.
British citizens cannot obtain an ETA.
There are limited exceptions, including circumstances affecting certain British citizens who previously held status under the EU Settlement Scheme, so travellers should check the current rules applicable to them before departure.
In some circumstances.
A person who renounced British citizenship because it was necessary to acquire or retain another nationality generally has a once-only statutory right to resume British citizenship, provided the relevant requirements are met.
Where citizenship was renounced for another reason, an application to resume British citizenship may be considered at the Home Secretary's discretion rather than being an automatic entitlement.
Understanding Your Dual Nationality Rights
Dual nationality UK law allows British citizens to hold another nationality, and there is no general UK restriction limiting a person to only two citizenships.
The more complicated issue is usually the law of the other country involved. Some countries freely recognise multiple citizenship, while others restrict it, require renunciation or treat their citizens exclusively as nationals of that country while they are within its territory.
Dual nationals should also be aware of the travel requirements introduced alongside full ETA enforcement from February 2026, particularly the need for British citizens to carry appropriate evidence of their right to travel to the UK.
Anyone considering British citizenship by naturalisation, acquiring another nationality or renouncing British citizenship should check how the laws of all relevant countries interact before taking action.
Have Questions About Dual Nationality?
Have questions about dual nationality and how it affects your immigration status? Our team can advise on your specific circumstances.
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