Guide updated · September 2026

Spanish citizenship by origin: who is Spanish from birth or adoption

The Civil Code considers certain people Spanish citizens by origin based on the circumstances of their birth, parentage or adoption. In many of these cases, the person does not need to be granted citizenship; they simply need to prove their status as a Spanish citizen, which derives directly from the law .

Quick answer: Spanish citizens by origin include children of Spanish fathers or mothers and certain people born in Spain to foreign parents. A child under 18 years of age adopted by a Spanish citizen also acquires Spanish citizenship by origin. Being born in Spain does not, by itself, always make someone a Spanish citizen.
Main rule

Child of a Spanish citizen

A person born to a Spanish father or mother is Spanish by origin, even if they are born outside Spain.

Born in Spain

There are several cases

Some children of foreign nationals born in Spain are Spanish by origin, but not all.

Adoption

Under 18 years of age

A foreign minor adopted by a Spanish national acquires Spanish nationality by origin from the date of adoption.

Overview

What does it mean to be Spanish by origin?

Spanish nationality by origin is a status that the law grants to certain people on the basis of their parentage, birth or adoption. The main cases are set out in Articles 17 and 19 of the Civil Code .

This should not be confused with acquiring nationality later through residence , option or naturalisation by Royal Decree .

Constitutional protection: Article 11.2 of the Constitution establishes that no person who is Spanish by origin can be deprived of their nationality. This does not mean that the legal rules on retaining or voluntarily losing nationality are irrelevant.
Articles 17 and 19

Who is Spanish by origin?

The Civil Code sets out several cases. They should be considered separately because simply being born in Spain is not enough .

01

Born to a Spanish father or mother

People born to a Spanish father or mother are Spanish by origin, regardless of whether they are born in Spain or abroad.

02

Born in Spain with a parent who was also born in Spain

People born in Spain to foreign parents are Spanish by origin if at least one parent was also born in Spain.

An exception applies to the children of a diplomatic or consular official accredited in Spain.
03

Born in Spain and would otherwise be stateless

People born in Spain to foreign parents are Spanish by origin if both parents are stateless or if neither parent's national law grants nationality to the child.

04

Born in Spain with parentage undetermined

People born in Spain whose parentage has not been established are also Spanish by origin.

A minor is presumed to have been born in Spain if their first known place of residence is Spanish territory.
05

Minors under 18 adopted by a Spanish national

A foreign national under the age of 18 adopted by a Spanish national acquires, from the date of adoption, Spanish nationality by origin .

A very common question

Is a child born in Spain automatically Spanish?

Not always. Spain does not generally grant Spanish nationality to every person simply because they were born in Spanish territory. One of the cases set out in Article 17 of the Civil Code must apply.

They may be Spanish by origin

Cases covered by law

  • Has a Spanish father or mother.
  • Is born in Spain and one of their foreign parents was also born in Spain, except in diplomatic or consular cases.
  • Is born in Spain and their parents are stateless.
  • Is born in Spain and neither parent's national law grants them nationality.
  • Is born in Spain and their parentage has not been established.
Not sufficient on its own

Being born in Spain

If a child of foreign parents acquires the nationality of either parent and no other circumstance under Article 17 applies, being born in Spain does not automatically make them Spanish by origin .

Other routes to acquiring Spanish citizenship may become available later.

Spanish nationality by simple presumption: determining whether the parents’ national laws pass on a nationality to their child requires examining the applicable national laws and the specific documentation. The decision should not be based solely on a generic list of countries found online.
Special situations

What happens if parentage, birth or adoption is established after the age of 18?

There is a fundamental difference here compared with the cases above. After the age of 18, certain circumstances no longer automatically result in the acquisition of Spanish citizenship.

Parentage or birth

Established after the age of 18

If parentage or birth in Spain is established after the person turns 18, that fact alone does not result in the acquisition of citizenship.

There is a right to opt for Spanish nationality by origin within 2 years of the determination.
Adoption

Adoption after the age of 18

If the adoption by a Spanish citizen takes place when the adoptee is already over the age of 18, citizenship is not acquired automatically either.

They may opt for Spanish nationality by origin within the 2 years following the adoption.
See the complete guide to Spanish nationality by option →
Proof

Do you have to apply for Spanish nationality by origin?

There is no single answer, as it depends on the circumstances. In many cases, Spanish nationality by origin arises directly under the law, but the birth and nationality must be properly documented and registered with the Civil Registry .

In other cases, a specific application is required. The best-known example is a declaration of Spanish nationality by simple presumption for certain children born in Spain to foreign parents.

1

Identify the applicable legal provision

Determine whether the case falls under Article 17, an adoption under Article 19 or a right to opt for citizenship.

2

Gather the certificates

It will generally be essential to provide proof of birth, parentage and the parents’ nationality, or of the adoption, depending on the case.

3

Check foreign documents

Foreign certificates may need legalisation, an apostille or an official translation.

4

Apply through the competent Civil Registry

The specific procedure will depend on the registration status and the legal basis on which citizenship is recognised.

Important differences

Spanish citizenship by origin, by option and by residence: different situations

Spanish citizenship by origin

This status derives from the law

It may apply from birth or be acquired through an adoption completed before the age of 18 years.

Articles 17 and 19
By option

Requires a declaration of intent

This route applies in certain circumstances provided for by law, including some involving people who are Spanish by origin.

View the option route →
Residence

Requires prior legal residence

This is a separate route that requires meeting the statutory residence period and the other requirements of the procedure.

View residence options →
Special protection

Can Spanish citizens by origin lose their citizenship?

The Constitution provides that no Spanish citizen by origin may be deprived of their citizenship . This means the State cannot impose the loss of this status as a penalty or through a unilateral decision.

However, the Civil Code sets out rules on loss of citizenship in certain situations, particularly those involving emancipated people who habitually reside abroad. Therefore, “cannot be deprived of it” and “can never lose it” do not mean exactly the same thing.

If you are already a Spanish citizen and plan to acquire or use another nationality, also check the rules on dual citizenship and retention before assuming that no formalities are required.
Frequently asked questions

Frequently asked questions about Spanish citizenship by origin

Am I a Spanish citizen by origin if my father or mother is Spanish?
As a general rule, Article 17.1.a of the Civil Code considers people born to a Spanish father or mother to be Spanish by origin. Where parentage is established later or specific historical circumstances apply, it may be necessary to consider the date and the legislation in force.
Does being born in Spain automatically make me a Spanish citizen?
No. Being born in Spain is not, by itself, sufficient in every case. One of the circumstances set out in Article 17 of the Civil Code must apply.
Can a child born in Spain to foreign parents be a Spanish citizen?
Yes, in certain cases. For example, if one of the foreign parents was also born in Spain, except in the case of diplomatic or consular personnel, or if neither parent's national law grants the child a nationality.
What is Spanish nationality by simple presumption?
This is the application that may be used in certain cases involving children born in Spain to foreign parents when both parents are stateless or neither parent's national law grants nationality to the child. The legislation of the parents' countries must be examined.
Is a minor adopted by a Spanish citizen Spanish by origin?
Yes. A foreign national under 18 who is adopted by a Spanish citizen acquires Spanish nationality by origin from the moment of adoption.
What happens if the adoption takes place after the age of 18?
There is no automatic acquisition of nationality. An adopted person over the age of 18 may opt for Spanish nationality by origin within two years of the adoption being legally constituted.
What happens if I discover that my father or mother is Spanish after the age of 18?
If the parent-child relationship that makes Article 17 applicable is established after the age of 18, it does not automatically grant nationality. There is a right to opt for Spanish nationality by origin within the following two years.
Can a Spanish citizen by origin be deprived of their nationality?
No. Article 11.2 of the Constitution provides that no Spanish citizen by origin may be deprived of their nationality. This is distinct from the legally regulated cases of loss of nationality, which may depend on certain acts or circumstances involving the person concerned.

Official sources

Next step

First, identify the grounds on which you may be Spanish

Place of birth is not the only criterion. The parents’ nationality, where they were born, parentage, age and any adoption can completely change which procedure applies.

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