The Brazilian Navy (Portuguese: Marinha do Brasil, lit. ‘Navy of Brazil’) is the naval service branch of the Brazilian Armed Forces, responsible for conducting naval operations. The Brazilian Navy is the largest navy in Latin America and the second largest navy in the Americas after the United States Navy.

The navy was involved in Brazil’s war of independence from Portugal. Most of Portugal’s naval forces and bases in South America were transferred to the newly independent country. In the initial decades following independence, the country maintained a large naval force and the navy was later involved in the Cisplatine War, the River Plate conflicts, the Paraguayan War as well as other sporadic rebellions that marked Brazilian history.