The Palace of the Argentine National Congress is a monumental building, seat of the Argentine National Congress, located in the city of Buenos Aires. It is located in the barrio of Balvanera at its limit with Monserrat, an area informally known as the Congreso neighbourhood.

The National Congress of Argentina is the legislative branch of the government of Argentina. Its composition is bicameral, constituted by a 72-seat Senate and a 257-seat Chamber of Deputies. The Senate, whose members are elected to six-year terms renewable by thirds each two years, consists of three representatives from each province and the federal capital. The Chamber of Deputies, whose members are elected to four-year terms, is apportioned according to population, and renews their members by a half each two years.