The 3 main ways to get Spanish Citizenship:
-Citizenship by option, if your father or mother is originally Spanish (born in Spain).
-Citizenship by residency. Depending on your country of origin, you can get nationality in 1,2,5 or 10 years. Getting married to a Spanish citizen and living with her for 1 year in Spain is the fastest way to get it.
-As a Sephardic jew
Learn more about Citizenship in Spain here: