The monarchs of Spain refer to the individuals who have held the title of king or queen and have ruled over the country of Spain. Throughout history, Spain has been ruled by various monarchs from different royal houses, including the House of Habsburg, the House of Bourbon, and the current reigning House of Bourbon. The role of the monarch in Spain has evolved over time, from absolute rule to a constitutional monarchy with limited powers. The monarchs of Spain have played significant roles in shaping the country's history, culture, and politics.