The Supreme Director of the United Provinces of the Río de la Plata (Spanish: Director Supremo de las Provincias Unidas del Río de la Plata) was a title given to the executive officers of the United Provinces of the Río de la Plata according to the form of government established in 1814 by the Asamblea del Año XIII (Assembly of Year XIII). The supreme director was to wield power for a term of two years.