The Argentine Constitution of 1826 was a short-lived Constitution of Argentina drafted during the Argentine Civil Wars. Bernardino Rivadavia was appointed President of Argentina under this constitution. It was rejected by most Argentine provinces, and then abolished.
The Argentine War of Independence, which began in 1810, was soon followed by the Argentine Civil Wars, as the provinces had conflictive views over the national organization. The federals supported the autonomy of the provinces, and the Unitarian party supported a political centralization of the country in Buenos Aires. The Argentine Constitution of 1819, drafted by the Congress of Tucumán, was highly centralist. It was abolished in 1820 after the federal victory at the battle of Cepeda. The office of the Supreme Director of the United Provinces of the Río de la Plata, the head of state at the time, was abolished as well. The provinces stayed united as a country by the Treaty of Pilar, but without any constitution or head of state for the time being. This period is known as the "anarchy of the year XX".
The Treaty of Benegas between Buenos Aires and Santa Fe included an agreement to call for a new Constituent Assembly, which would work at the city of Córdoba. The treaty did not mention the political system, which would be discussed at the assembly, nor the reaction to the Luso-Brazilian invasion of the Banda Oriental. The assembly was attended by representatives of Buenos Aires, Santa Fe, Córdoba, Mendoza, San Juan, La Rioja, Santiago del Estero, Tucumán and San Luis. However, the legal complaints of the representatives of Buenos Aires did not allow the Assembly to begin its work. The assembly was closed shortly afterwards.