You must be at least 18 years old: 

To drive in Spain you must be at least 18 years old. To rent a vehicle, you must be at least 21.

You must have a valid driver's licence:

If you are a citizen of the European Union, Switzerland, Norway, Iceland, or Liechtenstein: all you need is your valid driver's licence. If you are other country, you will need an International Driver's Licence.
Since conditions may vary, we recommend you contact your local Spanish Consulate or Embassy for more information on these requirements.

 

You must be at least 18 years old: 

To drive in Spain you must be at least 18 years old. To rent a vehicle, you must be at least 21.

You must have a valid driver's licence:

If you are a citizen of the European Union, Switzerland, Norway, Iceland, or Liechtenstein: all you need is your valid driver's licence. If you are other country, you will need an International Driver's Licence.
Since conditions may vary, we recommend you contact your local Spanish Consulate or Embassy for more information on these requirements.