Whether you need a visa for your internship in Spain depends on how long you’ll be staying. You can remain in Spain without a visa for up to 90-days. So if your internship is under three months, no visa is required. And if the internship is under six months, rather than applying for a visa, it might be easier to simply leave Spain at the 3 month mark, visit a neighboring country and re-enter Spain, making sure that your passport was stamped upon leaving and re-entering the country. This way, you’ll have another 90 days in Spain without the hassle of applying for a visa.
If you’ll be interning without pay for over six months, it is recommended that you apply for a student visa. Refer to the “You are going to study” section of this guide for information on how to apply for a student visa.
If your internship is remunerated, it is best that you apply for a work visa, although you may want to double check with the embassy or consulate to see if the same documentation is required. For information regarding application for a work visa, refer to the “You have a job and need to relocate” section of this guide.