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