1866 in Uruguay

Events in the year 1866 in Uruguay.

Incumbents

• President: Venancio Flores

Events

• May 2 - Paraguayan War: Battle of Estero Bellaco
• July 18 - Battle of Boquerón (1866)
• September 8 - establishment of Nuestra Señora del Carmen, Aguada, Montevideo
• September 22 - Battle of Curupayty

Deaths

• July 18 - León de Pallejas, Spanish-born general, killed in action