Dual Nationality
The place of birth, nationality, and individuals’ relationship with the state throughout their lives have long been subjects of analysis and debate in law and international law. In international law, nationality refers to the political and social allegiance of a natural or legal person to a particular state.
Nationality encompasses various relationships, including legal relations, due to the rights and privileges granted to the nationals of each country. At the same time, as an expression of state sovereignty and authority, nationality may also be regarded as a political relationship. Moreover, nationality is not limited solely to a person’s place of residence. Rather, it reflects a meaningful and enduring connection between the individual and the state.
Types of Nationality
Nationality is generally determined through two primary systems: the territorial system and the bloodline system. The territorial system is typically applied in immigrant-receiving countries, where a child acquires the nationality of the country of birth regardless of the parents’ nationality. The bloodline system, also known as nationality by descent, grants nationality to a child based on the nationality of one or both parents.
Nationality in Iran
Iranian nationality may be acquired through both the bloodline and territorial systems. Upon acceptance under the applicable legal provisions, an individual is recognized as an Iranian national.
Under Article 976 of the Civil Code of the Islamic Republic of Iran, individuals born to an Iranian father, as well as individuals born to foreign parents where one parent was born in Iran, are considered Iranian nationals.
All persons born in Iran, even when their parents’ identities are unknown, are granted Iranian nationality under the territorial system. Foreign women who marry Iranian men are regarded as Iranian nationals pursuant to paragraph six of Article 976 of the Civil Code. Accordingly, even if the husband renounces Iranian nationality, the woman retains her Iranian nationality.
In relation to the marriage of Iranian women to foreign men, Iranian law provides that the woman retains her Iranian nationality. If, under the laws of the husband’s country, the husband’s nationality is imposed upon the woman, she may nevertheless return to her original nationality after divorce or the death of her husband.
In matters of nationality, there are individuals who, for various reasons, do not hold the nationality of any country. Such individuals are referred to as stateless persons or apatrides.
Dual Nationality
An individual who holds more than one nationality simultaneously is considered to possess dual nationality and is recognized as a citizen of two or more countries. The issue of dual nationality becomes particularly significant when raised in the context of international disputes. In such cases, the court must determine the individual’s effective nationality based on the closest connection, including factors such as place of residence, duration of stay in a country, place of employment, and educational background.
Dual nationality may be acquired through various means, including birth, marriage, naturalization, and investment. Holding dual nationality may offer certain advantages and privileges.
Notable benefits of dual nationality include increased employment opportunities, the ability to obtain a second passport and benefit from its privileges, and access to broader educational and social services. However, dual nationality may also entail disadvantages and obligations, such as compulsory military service, the obligation to participate in armed conflict if required, double taxation, restrictions on employment in security-related positions, and the significant financial costs associated with acquiring and maintaining dual nationality.
Due to the challenges posed by dual nationality for both individuals and states, legal scholars have proposed solutions to address this issue.
The methods for resolving dual nationality include the following:
- Identification and determination of the effective nationality.
- Referral of disputes between states regarding the determination of effective nationality to international arbitration.
- Coordination between states through international agreements and conventions.
Frequently Asked Questions About Dual Nationality
Nationality is a political, social, and legal relationship between an individual and a state that grants specific rights and privileges. It also imposes legal obligations, such as taxation and military service, and reflects the individual’s meaningful connection to the state.
Nationality is generally acquired through two main systems: the territorial system based on place of birth, particularly in immigrant-receiving countries, and the bloodline system based on descent and the nationality of the parents.
Under Article 976 of the Civil Code, children of an Iranian father are Iranian nationals. In certain cases, children born in Iran to foreign parents also acquire Iranian nationality. Foreign women who marry Iranian men are considered Iranian nationals, and children born in Iran without identified parents are likewise granted Iranian nationality.
Statelessness refers to a situation in which an individual does not possess the nationality of any country. This condition creates significant legal, educational, occupational, and social challenges for the individual.
Dual nationality refers to a situation in which an individual holds more than one nationality at the same time and is recognized as a citizen by two or more countries. This issue is particularly relevant in international legal disputes, where the individual’s effective nationality must be determined.
Advantages include holding a second passport, greater employment opportunities, and broader access to educational and social services. Disadvantages may include compulsory military service in multiple countries, double taxation, restrictions on certain security-related professions, and the financial costs associated with acquiring dual nationality.
Legal scholars have identified three principal approaches: determining the effective nationality, referring disputes between states to international arbitration, and achieving coordination through international agreements and treaties. What is nationality, and why is it important?
What are the types of nationality?
How is nationality determined in Iran?
What does statelessness mean?
What is dual nationality?
What are the advantages and disadvantages of dual nationality?
How can dual nationality be resolved?





Does having two citizenships usually create tax obligations in both countries?
It can, depending on the laws of the countries involved. Anyone with dual citizenship should understand the legal and tax requirements that apply to their specific situation.
Is it possible for someone to lose one citizenship after obtaining another?
Yes. Some countries allow dual citizenship while others may require a person to give up their original nationality. It is important to review the laws of both countries before making any decisions.
Can dual citizens be required to use a specific passport when entering one of their countries?
Yes. Many countries require their own citizens to enter and leave using that country’s passport. The applicable travel rules depend on national law.
Are military service requirements ever an issue for dual citizens?
In some countries, military service obligations may apply to dual citizens. The requirements vary, so it is important to understand the laws of each country involved.
Can children automatically receive dual citizenship through their parents?
In many cases they can, but it depends on the citizenship laws of each country. Eligibility often varies based on birth location and parental citizenship.
Does dual citizenship usually make international travel easier?
It can provide additional travel flexibility in some situations, but dual citizens must also comply with the entry and exit requirements of both countries.
If someone already has dual citizenship, can they voluntarily give up one of them later?
In many jurisdictions, renouncing citizenship is possible, but the process and legal consequences differ from one country to another. Legal advice is often recommended before taking that step.
Do immigration laws change often enough that people should review them regularly?
Yes. Immigration and nationality laws can change over time, so staying informed or consulting an attorney before making important decisions is always a good idea.
Can spouses automatically receive citizenship because of their partner?
Not automatically in most cases. Marriage may provide a pathway to citizenship, but applicants generally must satisfy the legal requirements established by the country.
What is one of the most common misunderstandings people have about dual citizenship?
A common misconception is that dual citizenship only provides benefits. In reality, it often brings legal responsibilities in both countries, making it important to understand the applicable laws before pursuing it.