Formosa is the capital city of Formosa Department, Formosa Province, Argentina. It is traditionally inhabited by Tobas and Matacos Indians. Created in April 1879, Formosa had been the capital of the Territorio Nacional del Chaco from 1884 to ?.

Notable sites include Iglesia Catedral, the Isla de Oro (Golden Island), the Parque botánico forestal, the Provincial History Museum (Museo Histórico Provincial), a fauna reserve, and a football stadium, the Estadio Centenario.