ICL - Spain Index - - Complete copies and links to the country's Constitution, along with related background, history and events, provided by International Constitutional Law.
The Senate of Spain - - House of the Cortes Generales. What it is, how it works, and to learn more. With translation of the Constitution.
US Law Library of Congress - Spain - - Annotated compendium of online sources providing access to primary documents, legal commentary and general government information about specific jurisdictions and topics.
World Legal Information Institute - Spain - - Catalog and search facilities for over 500 databases from 55 countries including case-law, legislation, treaties, law reform reports, law journals, and other materials.