ABSTRACT The thesis called Castilian morphological processes in the Culle substrate and Andean Castilian of La Libertad is a descriptive research of morphological aspects that presents the culle substrate in relation to the Castilian of the Andean area referred geographically to six provinces: Bolivar, Pataz, Sánchez Carrión, Santiago de Chuco, Julcán and Otuzco. The corpus seeks to respond to the concise need to explain the most important behaviors of the word formators in a comprehensive panorama, but at the same time responds to specific issues. Thus, they are the result of five years of research into spontaneous conversations and semi-directed interviews with the speakers with whom I interacted and worked. Basically I focused on rural areas such as hamlets, population centers and districts. The missing or poorly understood data were subjected to a new reformulation based on more d...