Events in the year 1864 in Argentina.
Incumbents President: Bartolomé Mitre Vice President: Marcos Paz
Governors Buenos Aires Province: Mariano Saavedra Cordoba: Roque Ferreyra (starting month unknown) Mendoza Province: Carlos González Santa Fe Province: Patricio Cullen
Vice Governors Buenos Aires Province: vacant
Events 10 August – Uruguayan War: War breaks out between Brazil and Uruguay, despite negotiations involving Argentine Foreign Minister Rufino de Elizalde.Whigham, Thomas L. (2002). The Paraguayan War: Causes and Early Conduct 1. Lincoln, Nebraska: University of Nebraska Press. . 25 October – establishment of General Las Heras Partido 13 December – Paraguayan War: Paraguay declares war on Brazil; war with Argentina follows three months later.Scheina, Robert (2003). Latin America's Wars: The Age of the Caudillo, 1791–1899. Dulles, Virginia: Brassey's. The classic aperitif Hesperidina is invented by American immigrant Melville Sewell Bagley in Buenos Aires.
Deaths 30 October – Jonas Coe ("Comodoro Juan Coe"), US naval commander and supporter of Juan Manuel de Rosas (born 1805).Pérez Calvo, Lucio Ricardo (2008). Norteamericanos en la Argentina. Pérez Calvo, p. 143.
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