-Proboscideans are common constituents of the Quaternary megafauna in South America and their remains have been recovered over the entire continent; however, the records of Notiomastodon platensis are unknown in Bolivia, Guyana, French Guyana and Suriname. In this study, we describe the first record of Notiomastodon platensis from Bolivia. A N. platensis upper tusk was found in the Gran Chaco province, Tarija, a region widely known by its Quaternary megafauna, especially of the proboscidean Cuvieronius hyodon. The geographic distribution of both proboscideans suggests that they did not occur in sympatry, probably due to competitive exclusion (similar mixed-feeding diet) during the middle-late Pleistocene.