1865 in Argentina

Events in the year 1865 in Argentina.

Incumbents

 * President: Bartolomé Mitre
 * Vice President: Marcos Paz

Governors

 * Buenos Aires Province: Mariano Saavedra
 * Mendoza Province: Carlos González
 * Santa Fe Province: Patricio Cullen then Nicasio Oroño

Vice Governors

 * Buenos Aires Province: vacant

Events

 * March 5 – establishment of Bragado Partido
 * May 1 – Treaty of the Triple Alliance
 * July 9 – establishment of Nueve de Julio Partido
 * July 19 – establishment of Ayacucho Partido, General Lavalle Partido, Necochea Partido, Tapalqué Partido, Tordillo Partido and Lincoln Partido
 * August 5 – establishment of Chacabuco Partido

Births

 * April 26 – Luis Dellepiane, civil engineer, militarist and politician