Cándido Pastor Bareiro Caballero (October 27, 1833 in Luque Paraguay – September 4, 1880 in Asuncion, Paraguay) was President of Paraguay from 27 November 1878 to 4 September 1880 and the leading politician of the post-war decade.
Bareiro served as ambassador and commercial agent for the Paraguayan government of Francisco Solano López government in Europe.
During the last months of Paraguayan War he returned to Paraguay in 1869 and entered politics, where he started a political movement that would result in creation of the Colorado Party.
A strong ally of General Bernardino Caballero, he was elected President in 1878 with Caballero's help and died from a stroke after two years in office.