Where to apply for Spain citizenship
Spain citizenship by descent runs through Registro Civil / Consulate via the By origin (Art. 17) + option (Art. 20) pathway. Here's who processes your case and how to reach them.
Spanish Consulate / Registro Civil Central
Nationality by origin (Art. 17) and by option (Art. 20.1.b) are registered at your Spanish consulate or the Registro Civil Central in Madrid.
See if you qualify for Spain citizenship
Check your eligibility — freeNot affiliated with Registro Civil / Consulate or any government. A document-organization tool, not legal advice — always verify with the relevant authority.