Palacio Barolo is a landmark office building, located at 1370 Avenida de Mayo, in the neighborhood of Monserrat, Buenos Aires, Argentina. When it was built it was the tallest building in the city and South America. Its twin brother, Palacio Salvo, is a building designed and erected in Eclectic style, but of greater height, built by the same architect in Montevideo.
This building was declared a national historic monument in 1997. Currently, the building has several travel agencies, a Spanish school for foreigners, a store that sells clothes for tango, offices and studios of architects, accountants, lawyers, etc.