After a historiographic analysis of Regeneration and in particular, of multiple academic works published between 1970 and 2020, the article identifies that there is no single Regeneration, but multiple Regenerations. The document focuses on four of them: political, constitutional, economic and cultural Regeneration. Despite being related to each other, each one is characterized by its own periodization, particular reforms, and unique subtopics. It is necessary, therefore, to speak of Regeneration without first detailing which one or which of them is being referred to.