The Republic of South Peru (Spanish: República Sud-Peruana) was one of the three constituent Republics of the short-lived Peru–Bolivian Confederation of 1836–39.
South Peru was one of two states—the other being North Peru—that arose from the division of the Peruvian Republic due to the civil wars of 1834 and 1835 to 1836. The states were founded in 1836 to be constituent Republics of the planned Peru-Bolivian Confederation, alongside Bolivia.