An International Bilateral Comparison of Platinum Resistance Thermometers was performed between the National Metrology Institutes of Chile (LCPNT) and the Ecuadorian Standardization Institute of Ecuador (INEN), both represented by their National Laboratories of Temperature. This comparison was carried out in the range from -39 degrees C up to 232 degrees C. The final results obtained by each laboratory showed to be equivalent (E-N < 1) in the measured temperature range.