The current Constitution of Argentina dates from 1853. The Constitution of Argentina of 1853 was approved in 1853 by almost all of the provincial governments at that moment with the exception of Buenos Aires Province, which remained separate from the Argentine Confederation until 1859. After several modifications to the original constitution and the return of power to Buenos Aires' Unitarian Party, it was sanctioned on May 1, 1853, by the Constitutional Convention gathered in Santa Fe, and it was promulgated by the provisional director of the national executive government Justo José de Urquiza, a member of the Federalist Party. Following the short-lived constitutions of 1819 and 1826, it was the third constitution in the history of the country.

The Constitution of the Argentine Nation is the basic governing document of Argentina, and the primary source of existing law in Argentina. Its first version was written in 1853 by a constitutional assembly which gathered in Santa Fe; the doctrinal basis was taken in part from the United States Constitution. It was then reformed in 1860, 1866, 1898, 1949, 1957, and the current version is the reformed text of 1994. It's the seventh oldest national constitution currently in effect being ratified on May 1, 1853.