The flag used by the Santiago del Estero province in Argentine consists of five vertical stripes.

Light blue and white are the Argentine national colors, while red represents the Federalist Party to which the province owes its autonomy.

The cross represents the Catholic and Spanish heritage of the region.

[1] It is the oldest continuously used provincial flag in Argentina, approved by Law No.

5355 passed on 1985, although the use of the flag was clarified a year later by modifications to the law.