Juanjuí is a town in Northern Peru, capital of the province Mariscal Cáceres in the San Martín Region and located in the left edge of Huallaga River.

The population of Juanjui was originally formed mainly by Kichwa-Lamista immigrants from the province of Lamas, who migrated from the late eighteenth and early decades of the nineteenth century.

[2] It is said that the pioneer of these immigrants was an Amerindian named Juan, who fled the Lamas, or by the mistreatment or persecution for justice of the missionaries.

Over the years, Juan Huido was derived the name of Juanjui to designate in any way to these territories.

In Juanjui, there are 8 representative neighborhoods around downtown: The town has some monuments dedicated to the ancient Gran Pajaten settlement that is located close by.