This article examines Brazil's foreign policy towards the Carnation Revolution from diplomatic sources. While international public opinion and several chancelleries were surprised by the Carnation Revolution, even in 1973, Brazilian diplomacy made a solid prediction, maintaining that Portugal would undergo sudden and profound changes. It is no coincidence that the country was the first to recognize the new regime. With the overthrow of the Estado Novo, communist and socialist influence was accompanied by Brazilian diplomacy. However, this diplomacy did not interfere with Portugal's internal affairs. The only controversial move by the Brazilian government was to nominate Carlos Alberto da Fontoura, former head of the National Information Service (SNI), to be Brazil's ambassador in Lisbon, which sparked protests from several Portuguese groups. The Brazilian government's biggest concern was the exchange between opposition activists of the civil-military regime. There was fear that Portuguese activists would come to Brazil to promote a revolution and that Brazilian activists would go to Portugal to promote opposition campaigns against the Brazilian regime. In summary, during the revolution and the consolidation of a liberal and democratic government, Brazil/Portugal's bilateral relations were cordial and positive, without interference from either side.