Supreme director (in Spanish director supremo) was a title used to designate the unipersonal executives of Argentina and Chile shortly after their independence from Spain. Before the creation of the office, executive power had been wielded by collective bodies such as government juntas and triumvirates.
The office of Supreme Director of the United Provinces of the River Plate existed in Argentina between 1814 and 1820. It existed both before and after the Second Triumvirate and was succeeded by the so-called Anarchy of the 1920's (Anarquia del ano 20).
In Chile, a corresponding office existed for a period in 1814 and between 1817 and 1826, at which point executives assumed the title of president.