The Supreme Central and Governing Junta of the Kingdom (also known as Supreme Central Junta, the Supreme Council, and Junta of Seville; Spanish: Junta Suprema Central) formally was the Spanish organ that accumulated the executive and legislative powers during the Napoleonic occupation of Spain. It was established on 25 September 1808 following the Spanish victory at the Battle of Bailén and after the Council of Castile declared null and void the abdications of Charles IV and Ferdinand VII done at Bayonne earlier in May. It was active until 30 January 1810. It was initially formed by the representatives of the provincial juntas and first met in Aranjuez chaired by the Count of Floridablanca, with 35 members in total.
The Supreme Central Junta grew out of political confusion that followed the abdication of the House of Bourbon. The Spanish government, including the Council of Castile, initially accepted Napoleon's decision to grant the Spanish crown to his brother Joseph. The Spanish population, however, almost uniformly rejected Napoleon's plans and expressed this opposition through the local municipal and provincial governments. Following traditional Spanish political theories, which held that the monarchy was a contract between the monarch and the people (see Philosophy of Law of Francisco Suárez), local governments responded to the crisis by transforming themselves into ad hoc governmental (Spanish for "council," "committee," or "board").
This transformation, nevertheless, led to more confusion, since there was no central authority and most juntas did not recognize the presumptuous claim of some juntas to represent the monarchy as a whole. The Junta of Seville, in particular, claimed authority over the overseas empire, because of the province's historic role as the exclusive entrepôt of the empire. Realizing that unity was needed to coordinate efforts against the French and to deal with British aid, several provincial juntas—Murcia, Valencia, Seville and Castile and León—called for the formation of a central one. After a series of negotiations between the juntas and the discredited Council of Castile, the Supreme Central Junta met in Aranjuez. The Junta served as surrogate for the absent king and royal government, and it succeeded in calling for representatives from local provinces and the overseas possessions to meet in an "Extraordinary and General Cortes of the Spanish Nation," so called because it would be both the single legislative body for the whole empire and the body which would write a constitution for it.