- Buenos Aires, capital ofArgentina
- Province of Buenos Aires, province of Argentina
- Buenos Aires, municipality of Brazil in the state of Pernambuco
- Buenos Aires, municipality of Colombia in the department of Cauca
- Buenos Aires, district of the Costa Rica capital of the canton of the same name
- Canton of Buenos Aires, canton of Costa Rica
- Buenos Aires, district of Costa Rica in the canton of Palmares
- Buenos Aires, municipality of Nicaragua in the department of Rivas
- Buenos Aires, district of the Peru in the Province of Picota
Other
- Buenos Aires lake, lake of the Patagonia