Although "Argentina" was already in common usage by the 18th century, the country was formally named "Viceroyalty of the Río de la Plata" by the Spanish Empire, and "United Provinces of the Río de la Plata" after independence.
Selvom "Argentina" allerede var almindeligt at bruge i det 18. århundrede, så kaldtes landet officielt "Viceroyalty of the Río de la Plata" af det spanske rige, og "United Provinces of the Río de la Plata" efter at landet blev selvstændig stat.