Guaycuru or Guaykuru is a generic term for several ethnic groups Indigenous to the Gran Chaco region of South America, who speak related Guaicuruan languages. At the time of first contact with Spanish

The Pilagá are an Indigenous people of the Guaycuru group that inhabits the center of the province of Formosa, in Argentina. Some migrant groups also live in the provinces of Chaco and Santa Fe.