Portuguese Citizenship by Descent

How Descent Works in Portuguese Nationality Law

Portuguese nationality law follows the principle of jus sanguinis (right of blood). This means nationality primarily passes through family lineage. However, the rules are not the same for every generation:

• Children of Portuguese citizens are Portuguese from birth — the most straightforward case
• Grandchildren may acquire nationality by declaration, but must demonstrate connection to the Portuguese community and knowledge of language, culture, history, and national symbols
• Great-grandchildren follow the naturalisation regime, requiring a period of legal residence in Portugal (which depends on nationality — see below) plus full integration requirements

Each generation has its own legal basis, conditions, and procedure. This guide covers all three.

Children of Portuguese Citizens

Children born to at least one Portuguese parent are Portuguese from birth, regardless of where they are born. This is the foundational principle of Portuguese nationality law (Article 1 of Lei n.º 37/81).

What If the Portuguese Parent Lost Nationality?

In some historical cases, Portuguese citizens lost their nationality (for example, by acquiring another nationality under older versions of the law). If the parent lost Portuguese nationality before the child was born, the child may not automatically be Portuguese. However, if the parent later reacquired Portuguese nationality, the child's situation may be reassessed. These cases can be complex — consult the IRN or a qualified lawyer.

Grandchildren of Portuguese Citizens

Grandchildren of Portuguese citizens can acquire Portuguese nationality by declaration under specific conditions. This is not automatic — you cannot simply claim Portuguese nationality because your grandparent was Portuguese.

Connection to the Portuguese Community

The law requires grandchildren to show a genuine connection to Portugal. Evidence may include:

• Visits to Portugal and time spent in the country
• Knowledge of Portuguese language and culture
• Membership of Portuguese community organisations abroad
• Family ties in Portugal
• Property, investments, or business in Portugal
• Participation in Portuguese cultural events or associations

Language and Cultural Knowledge

Under the 2026 law, grandchildren must demonstrate not only knowledge of Portuguese language but also knowledge of Portuguese culture, history, and national symbols. The specific methods for evaluating culture, history, and symbols knowledge may still be subject to implementing regulations — consult the IRN for the current assessment format and requirements.

For the language component, A2-level certificates (such as CIPLE) have historically been accepted as proof. Under the 2026 law, the requirement is described more broadly as "sufficient knowledge of the Portuguese language." See our Language & Integration Requirements Guide for details on current assessment standards.

Great-Grandchildren of Portuguese Citizens

The 2026 law introduced a new route for great-grandchildren of Portuguese citizens. However, this is not a simple declaration — great-grandchildren follow the naturalisation regime, which has significantly stricter requirements.

Requirements for Great-Grandchildren

• Legal residence in Portugal (autorização de residência) — under the 2026 law, the general naturalisation regime requires 7 years for nationals of CPLP countries and EU citizens, or 10 years for other nationals. A specific provision for descendants of Portuguese citizens at the second degree (grandparents) allows naturalisation after 5 years, but it is not clear whether this extends to the third degree (great-grandparents). Confirm the applicable residence period with the IRN
• Full integration requirements: Portuguese language knowledge plus knowledge of Portuguese culture, history, national symbols, and democratic principles
• Solemn declaration of adherence to the democratic rule of law
• Proof of financial means to support themselves
• No criminal record involving a sentence of 3 or more years for serious crimes

In practice, this means great-grandchildren must relocate to Portugal, obtain legal residence, reside in the country for the applicable period, and satisfy the same integration criteria as any other naturalisation applicant — with the ancestral connection serving as the qualifying link.

Adopted Children

A child who is fully adopted (adopção plena) by a Portuguese citizen acquires Portuguese nationality. This follows the same principle as biological parentage — the adopted child is treated as the natural child of the adopting parent for nationality purposes. The adoption must be a full adoption recognised under Portuguese law.

Sephardic Route (Closed)

Portugal previously offered a naturalisation route for descendants of Portuguese Sephardic Jews. This route has been closed for new applications. Applications that were pending before the closure continue to be processed under the previous rules, but no new applications are accepted.

If you believe you had a pending application, contact the IRN or the Portuguese Jewish communities of Lisbon or Porto for guidance on the status of your case.

Documents You Will Need

The specific documents depend on your relationship to the Portuguese ancestor and which route you are using. Generally, you will need:

For Grandchildren (Declaration Route)

• Your birth certificate — with apostille and certified Portuguese translation if needed
• Your parent's birth certificate — showing the link to the Portuguese grandparent
• The Portuguese grandparent's birth certificate — proving they were Portuguese of origin
• Criminal record certificates from all countries where you have lived since age 16
• Proof of connection to the Portuguese community
• Proof of Portuguese language knowledge (historically A2 level or higher — see Language & Integration Requirements)
• Evidence of knowledge of Portuguese culture, history, and national symbols

For Great-Grandchildren (Naturalisation Route)

• All of the above, plus birth certificates establishing the generational chain
• Proof of legal residence in Portugal for the applicable period (see requirements above)
• Proof of financial means
• Proof of integration (language, culture, history, symbols, democratic principles)

For a comprehensive checklist, see our Required Documents Guide.

How to Apply

The application procedure depends on the route:

Children (Registration)

Register the birth at a Portuguese civil registry office (in Portugal) or at the Portuguese consulate in the country where the child was born. Bring the Portuguese parent's identification and proof of nationality.

Grandchildren (Declaration)

Submit a declaration of nationality to the IRN. Applications can be made at:

• Nationality service counters at designated civil registry offices in Portugal
• Portuguese consulates abroad
• Online through a legal representative via the IRN system
• By post to the Conservatória dos Registos Centrais

Great-Grandchildren (Naturalisation)

Apply for naturalisation through the IRN, following the same channels as the grandchild route. You must be living in Portugal with legal residence at the time of application.

Fees vary by route. Check the current fee on the IRN or ePortugal website before submitting.

Common Questions

My grandparent was Portuguese. Am I automatically Portuguese?

No. Grandchildren of Portuguese citizens are not automatically Portuguese. You must make a formal declaration and meet the requirements, including demonstrating connection to the Portuguese community and knowledge of the language, culture, history, and national symbols.

My great-grandparent was Portuguese. Can I get citizenship from abroad?

Under the current law, great-grandchildren follow the naturalisation regime, which requires a period of legal residence in Portugal (7 years for CPLP/EU nationals or 10 years for other nationals under the general regime — confirm the applicable period with the IRN). You cannot obtain nationality through this route without living in Portugal.

Does my parent need to be Portuguese first?

For the grandchild route, your parent does not need to have claimed Portuguese nationality themselves. The requirement is that the grandparent was Portuguese of origin. However, if your parent also qualifies and claims nationality first, it may simplify your own path, as you would then be the child of a Portuguese citizen.

What does "Portuguese of origin" mean?

"Portuguese of origin" (português de origem) means the person was Portuguese from birth, rather than having acquired nationality later through naturalisation. The grandparent must also not have lost their Portuguese nationality. This distinction is important for the grandchild declaration route.

Is the Sephardic route still available?

No. The Sephardic route is closed for new applications. Pending applications continue to be processed under the previous rules. No new applications are accepted through this route.