Pedro Celestino Joseph Negrete y Falla (14 May 1777 – 11 April 1846) was a Spanish politician and military man who served as a member of the interim government of Mexico after the abolition of the First Mexican Empire. He fought alongside of Agustín de Iturbide in the royalist army during the Mexican War of Independence. He was a close collaborator of Iturbide during the empire and then pressured him to abdicate the Mexican crown.
The Supreme Executive Power (Spanish: Supremo Poder Ejecutivo) was the provisional government of Mexico that governed between the fall of the First Mexican Empire in March 1823 and the election of the first Mexican president, Guadalupe Victoria, in October 1824. After Emperor Agustín abdicated, the sovereignty of the nation passed over to Congress, which appointed a triumvirate, made up of Guadalupe Victoria, Pedro Celestino Negrete, and Nicolas Bravo, to serve as the executive, while a new constitution was being written.
During this period the government oversaw the transition of the nation from monarchy to a republic, abolishing all titles of nobility, changing the national symbols, and removing from power the remnants of the imperial government. Iturbide himself and his family were exiled to Europe, and when he attempted to return in July 1824, he was captured and executed.