You can apply for Spanish citizenship by descent if you were born outside Spain to parents or grandparents who were originally Spanish or to a Spanish woman who lost their nationality because she married a foreigner before the enactment of the 1978 Constitution.
CitizenX can expertly handle your entire citizenship by descent application, simplifying complex Spanish laws and helping you prove your lineage by consulting various institutions and archives, all the way to you receiving your Spanish passport.
To qualify for Spanish citizenship, you must give up your original citizenship, unless you are a citizen of an Ibero-American country (Mexico, Argentina, Peru, Philippines, Cuba, Bolivia, Chile, Colombia, Costa Rica, Dominican Republic, Ecuador, El Salvador, Guatemala, Honduras, Venezuela, Panama, Paraguay, Brazil, Nicaragua, Uruguay, and Puerto Rico), as established by the Resolution of 27 June 2007 from the General Directorate of Registries and Notaries. Additionally, citizens of Andorra, France, Portugal, and Equatorial Guinea are exempt from this requirement.