Carta de Naturaleza (Art 21.1 CC)

Overview. The Carta de Naturaleza is a discretionary grant of Spanish nationality made by Royal Decree under Article 21.1 of the Código Civil. Unlike the ordinary residence-based naturalisation pathways, it is awarded at the discretion of the State when exceptional circumstances concur, rather than on the basis of a fixed residence period or an entitlement that the applicant can demand as of right. This makes it an extraordinary route, reserved for cases that fall outside the standard acquisition mechanisms.

The grant is made by the Consejo de Ministros (Council of Ministers) by Royal Decree, and the route operates within the general Spanish nationality framework set out in Articles 17 to 26 of the Código Civil (Título Primero, Libro Primero: De la nacionalidad). The constitutional anchor is Article 11 of the Constitución Española of 1978, under which Spanish nationality is acquired, conserved, and lost in accordance with the law.

Administration of nationality matters sits with the Dirección General de Seguridad Jurídica y Fe Pública (DGSJFP), under the Ministerio de Justicia, together with the territorial Registros Civiles. Apex review is exercised by the Tribunal Constitucional on constitutional questions and by the Tribunal Supremo (Sala 3ª, contencioso-administrativo) on administrative-law challenges.

Because the route depends on the recognition of exceptional circumstances rather than a set qualifying period, its timeline is variable and its documentation burden is high. Applicants must substantiate the exceptional grounds invoked, and the outcome rests on the discretionary assessment of the competent authority.