Portuguese nationality for grandchildren of Portuguese citizens

Portuguese nationality law allows grandchildren of Portuguese citizens to obtain Portuguese nationality of origin, provided they meet the legal requirements. In 2026 this route was kept but became more demanding: Organic Law 1/2026, in force since 19 May 2026, added requirements that did not exist before.

This guide explains who can apply, what changed, which documents to gather and how to avoid the mistakes that delay the process the most.

Who can apply as a grandchild?

Anyone with at least one grandparent who is Portuguese by origin and has not lost that nationality can apply. The applicant's parent does not need to be Portuguese: the link is made directly to the grandparent, but it must be shown through certificates across the whole family line.

The applicant does not need to live in Portugal either. Nationality is granted by declaration, not by naturalisation, which means it is nationality of origin.

What changed with Organic Law 1/2026?

Previously, the law required proof of effective ties to the Portuguese community, which in practice was shown mainly through knowledge of the language. After the reform, granting nationality to grandchildren also depends on requirements the law sets for naturalisation:

• sufficient knowledge of the Portuguese language and culture, history and national symbols;
• knowledge of fundamental rights and duties and of the political organisation of the State;
• a declaration of adherence to the principles of the democratic rule of law;
• no convictions for certain serious crimes and no threat to national security.

For nationals of Portuguese-speaking countries, such as Brazilians, the law provides a presumption of language knowledge. How knowledge of culture, history and rights is proven depends on the Nationality Regulation, so it is essential to check the practice in force on the date of application.

The reform also created a route for great-grandchildren, which requires 5 years of legal residence in Portugal, and no longer provides for later generations.

What about people who had already applied?

Cases already pending on 19 May 2026 continue to be assessed under the previous law. Applications filed from that date onwards follow the new rules.

Which documents are required?

• the nationality application declaration, on the official form;
• the applicant's full-content birth certificate, with a Hague apostille;
• the full-content birth certificate of the parent who is the child of the Portuguese grandparent, also apostilled;
• the grandparent's Portuguese birth certificate, which may be waived if the registry details are provided;
• a valid identity document;
• criminal record certificates from the relevant countries, such as those of nationality and residence;
• proof of payment of the application fee.

Where and how is the application filed?

The application is filed with the Central Registry Office or other competent registry services, such as nationality desks and consulates. When filed by a lawyer or solicitor, submission is electronic. Official information is available on the Justice portal.

Following the case through to the final decision can take time. Once granted, nationality is registered and you can apply for a Portuguese citizen card and passport.

Which mistakes delay the process the most?

• discrepancies in names, dates or spellings between the certificates of the three generations;
• short-form certificates when the full-content version is required;
• documents without an apostille or issued too long ago;
• a grandparent who became Portuguese by naturalisation rather than by origin;
• an ancestor who lost Portuguese nationality and did not recover it.

Correcting certificates before applying, through annotation or rectification in Brazil, is almost always faster than answering requests for clarification later. A well-prepared, consistent file reduces the risk of refusal. If you are thinking of living in Portugal while the case is under way, see also the D7 and D8 visas.

This article is for information only and does not replace a legal consultation.