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Decades:	1840s; 1850s; 1860s; 1870s; 1880s;
See also:	Other events of 1866; List of years in Argentina

Events in the year 1866 in Argentina.

Incumbents

Buenos Aires Province: Mariano Saavedra (until 1 May), Adolfo Alsina (starting 1 May)
Mendoza Province:
- until 1 November: Carlos González
- 1 November-11 November: Melitón Arroyo
- starting 11 November: Carlos Juan Rodríguez
Santa Fe Province: Nicasio Oroño

January 31 – Paraguayan War: The Battle of Pehuajó takes place when about 1500 Paraguayan troops, commanded by General Francisco Isidoro Resquín and Lieutenant Celestino Prieto, engage in a surprise attack Argentinian and Uruguayan battalions with around 2000 men, led by General Emilio Conesa; the Paraguayans are successful and the joint Argentine-Uruguayan force suffers heavy casualties.^[1]
May 24 – Paraguayan War: First Battle of Tuyutí is an allied victory.^[2]
July 18 – Battle of Boquerón (1866)
September 1–3 – Battle of Curuzú
September 22 – Battle of Curupayty

^ O'Leary, Juan; El Libro de los Héroes; Editorial Servilibro; Asunción, Paraguay (2007)
^ Williams, John Hoyt (2000), "A Swamp of Blood: The Battle of Tuyuti", Military History 17 (1): 58–64.

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