Manuel Justo Pardo y Lavalle (9 August 1834 – 16 November 1878) was a Peruvian politician who served as the 20th President of Peru.

His mother was a daughter of the 2nd Count of Premio Real and a sister of politician Juan Bautista de Lavalle.

He spent his early years in Chile where his father served successively as Minister Plenipotentiary for the governments of Felipe Santiago Salaverry and Ramón Castilla.

Next year, he settled down in Paris and attended the Collège de France, where he studied literature and economy under Philarète Chasles and Michel Chevalier.

The objective of this pact was to protect themselves from what they perceived as "Chilean imperialism" and a growing desire of Chile for the allied provinces of Tarapacá and Litoral.