The Battle of La Ciudadela (Battle of the Citadel) was a fight during the Argentine Civil Wars between Federalist troops commanded by Facundo Quiroga and Unitarian troops of Gregorio Aráoz de Lamadrid on the outskirts of San Miguel de Tucumán, Argentina, on 4 November 1831.

The next morning, at the Citadel, Quiroga divided his forces into two halves, the left under General José Ruiz Huidobro, and the right led by Martín Yanzón and Nazario Benavídez, who would later be governors of San Juan Province.

But Quiroga personally brought back to the battlefield each regiment that was dispersed, and slowly it became clear that victory would be for the federal forces.

Furthermore, the efficiency with which the federal caudillo was obeyed, as compared to the Unitarians, made the numerical superiority of the Tucuman forces less important to the result.

[4] Lamadrid and most of its officers sought refuge in Salta Province, but the provincial government refused to organize a new army to oppose Quiroga, and they had to flee to Bolivia.

General Alejandro Heredia was elected governor of Tucumán, and through his influence the Salta government was assumed by the Federalist Pablo Latorre.