7 Countries That Don't Allow Dual Citizenship (Why Mexico Isn't One)
Many travelers believe holding two passports is always allowed. The truth is that many countries that don't allow dual citizenship still exist, and they enforce their laws strictly.
These laws can lead to automatic loss of your original nationality, and even entry denial if the government knows you hold two passports.
These dual citizenship restrictions mean real concern for immigrant families in the United States.
If you're a Mexican American in the USA, you might worry that applying for Mexican citizenship will cause you to lose your American citizenship or lead to a legal conflict between both countries.
This concern is reasonable if your family or ancestors were from Asia or Europe, but Mexico's legal structure is positive.
Understanding how these bans work helps you appreciate why the Mexican citizenship application is such an advantage.
What Does It Mean When Countries Ban Dual Citizenship?
When we talk about countries that ban dual citizenship, we are referring to specific dual nationality laws that punish or revoke a second nationality.
There are two main enforcement pathways. The first one is automatic loss. In this way, the law states that if you acquire a foreign citizenship by yourself, you have decided to terminate your citizenship of your home country. No hearing is required.
The second way is the mandatory choice. A child may be born with two nationalities, but when reaching legal age, usually between 18 and 21, they must declare which nationality they want to keep. If they choose the foreign one, or fail to choose at all, they lose their original citizenship.
Both pathways show how strict dual citizenship restrictions are.
7 Countries that don't Allow Dual Citizenship
Here are seven examples of countries that don't allow dual citizenship and what happens if you disrespect their rules. Take note:
1. China
China has one of the hardest dual nationality laws in the world. According to Article 3 of the Chinese Nationality Law, China does not recognize dual nationality for any Chinese citizen, and Article 9 states that a Chinese national who acquires another citizenship immediately loses Chinese nationality.
There is no dual system and no exception for citizenship by birth abroad. If Chinese authorities find you have traveled using a foreign passport, they will refuse to renew your Chinese passport and may revoke your Hukou residency (system of household registration).
For Beijing, once you swear an oath to another country, you are no longer a Chinese citizen.
2. Japan
Japan is one of the most popular countries that don't allow dual citizenship for adults. The Japanese Nationality Act requires citizens with dual citizenship to choose one nationality before they reach the age of 21.
For example, if you were born with both Japanese and American citizenship, you must submit a Declaration of Choice at your local ward office. If you naturalize as an American later in life, you are required to renounce your Japanese citizenship legally.
While Japan has not prosecuted every case, the Ministry of Justice can issue a formal notice demanding you choose. If you fail to follow, you can lose your Japanese nationality.
3. India
India is a great example of a country that bans dual citizenship entirely. The Indian Constitution does not allow any national to hold Indian citizenship with another one.
Instead of dual citizenship, India provides the “Overseas Citizenship of India”, or OCI, card. This is not dual citizenship.
An OCI card does not give you an Indian passport, does not give you the right to vote, cannot be used to apply for government positions, and does not allow you to buy land (agricultural).
If you are of Indian origin and become a U.S. citizen, Indian law considers that you have lost Indian citizenship automatically, and you must give up your Indian passport.
4. Singapore
Singapore has a complete ban on dual citizenship with zero tolerance. This is a crucial part of Singapore's law policy, built on the idea of “singular loyalty”.
For Singaporean citizens, the rules are absolute. Any Singaporean born with a second nationality must take the Oath of Renunciation, Allegiance and Loyalty once they turn 21 and legally renounce other nationalities.
For foreigners who want to become Singaporean, the Immigration and Checkpoints Authority requires proof that you have renounced your previous citizenship before they grant Singaporean nationality. Failure to renounce results leads to automatic loss.
5. Austria
Austria is one of the countries in Europe that still bans dual citizenship for most of its citizens. Under Austrian law, if an Austrian acquires a foreign nationality by their own will, they automatically lose their Austrian citizenship, specifically at the moment of acquisition.
You can only keep both if you obtain a special permit called “Beibehaltung”, before you acquire the other citizenship. This permit is very hard to get and is only granted when it is in the national interest or for certain personal reasons.
Exceptions are possible if you receive the second citizenship at birth, but for naturalization, it's almost impossible.
6. Netherlands
The Netherlands has a system of partial dual citizenship restrictions. The Dutch government discourages dual nationality, even if it does not totally ban it.
If you are a Dutch citizen and you acquired another nationality, you will automatically lose your Dutch citizenship under their law.
However, there are three key exceptions: if you acquire the other nationality through marriage, if you were born in the other country and lived there for at least 5 years, or if you cannot renounce your other nationality.
For outsiders who look to become Dutch, rejection of your original nationality is an obligatory requirement for naturalization unless it is legally impossible.
7. Saudi Arabia
Saudi Arabia has one of the most severe bans among countries that don't allow dual citizenship. Their law forbids a Saudi citizen from acquiring any foreign nationality without first obtaining certified permission from the Prime Minister of Saudi Arabia.
If a citizen obtains another passport without permission, the government considers it a defiance. The authorities may revoke Saudi citizenship, financial penalties, and take over the Saudi passport.
Those wishing to become Saudi citizens, documented and full surrender of any previous nationality is required. Hiding a second passport is considered fraud under Saudi nationality law.
Why Mexico is not on the List - Good News for Mexican Americans
Compared to all the countries in the list above, Mexico is not one of the countries that don't allow dual citizenship. It's actually one of the most permissive countries in the world.
Since the constitutional reform to Articles 30 and 37 in 1998, Mexico has recognized dual citizenship. This was created to protect Mexicans living abroad. You do not lose your Mexican nationality if you become a U.S. citizen, and you do not lose your U.S. citizenship if you reclaim your Mexican nationality.
Mexico recognizes you as Mexican by birthright through your parents, a principle known as “jus sanguinis”.
This legal statement is why thousands of second- and even third-generation Mexican Americans are now getting their dual citizenship without risks to their American status.
If you want to understand the full legal basis of whether Mexico allows dual citizenship, the law is clear: it is allowed and protected by the Mexican Constitution.
FAQ About Dual Citizenship Bans
Do any countries ban dual citizenship completely?
Yes. Countries such as China, Japan, Singapore and Saudi Arabia ban dual citizenship completely. If you acquire another nationality, you automatically lose your original citizenship under their dual nationality laws.
Can I have dual citizenship with Mexico and the U.S?
Yes. You can legally have dual citizenship with Mexico and the U.S.; both countries allow it. You can have two passports and pass both nationalities to your children.
What countries allow dual citizenship with the U.S.?
Over 100 countries allow dual citizenship with the U.S. Popular nations include Mexico, Canada, Ireland, the UK, Germany, Italy, and Australia.
Mexico is one of the most permissive countries. Since its 1998 constitutional reform, Mexicans can naturalize in the U.S. (and vice versa) without losing their original legal rights, citizenship, or passport.
What country is the hardest to get citizenship?
Vatican City and Qatar are considered the hardest countries in the world to get citizenship.
Vatican City has no open path or birthright; citizenship is by active service in the Holy See. Qatar requires 25 years of residency, high Arabic language, and renunciation of original citizenship.
Your Mexican Heritage is not a Restriction
While many countries that ban dual citizenship force their citizens to make a complicated choice between family and opportunity, Mexico does the opposite. It encourages and promotes you to keep both.
The seven countries above show what real dual citizenship restrictions look like: automatic loss, renunciation by law enforcement, and legal penalties. Mexico chose a different path in 1998, a path that recognizes that you can be fully American and fully Mexican.
For Mexican Americans, this is not a legal problem; it is a legal advantage that very few other communities have.
The good news is you don't have to worry about citizenship restrictions with Mexico.
DNExpress handles your Mexican dual citizenship completely online, without in-person appointments. Email contact@dnexpress.org (send us a message to reconnect with your roots).
You can also send us a message to our WhatsApp number (664) 399 4463 or make a call at our U.S. number (619) 484 1831.
