The Brazilian Army is the branch of the Brazilian Armed Forces responsible, externally, for defending the country in eminently terrestrial operations and, internally, for guaranteeing law, order and the constitutional branches, subordinating itself, in the Federal Government's structure, to the Ministry of Defense, alongside the Brazilian Navy and Air Force. The Military Police and Military Firefighters Corps are legally designated as reserve and auxiliary forces to the army. Its operational arm is called Land Force. It is the largest army in South America and the largest branch of the Armed Forces of Brazil.

The Brazilian Armed Forces are the unified military forces of the Federative Republic of Brazil. Consisting of three service branches, it comprises the Brazilian Army, the Brazilian Navy and the Brazilian Air Force.