This project belongs to the field of Political Communication and aims to do an comparative analysis of the messages posted on Twitter by Jair Bolsonaro and Andrés Manuel López Obrador during the last presidential elections in Brazil and Mexico. It is expected, therefore, to contribute to the studies of populism in Latin America and to the discussion on how populist political actors carry out electoral campaigns in the context of the studied regions, paying special attention to the uses given to the communication opportunities offered by digital environments. First, a theoretical contextualization of populism will be presented, passing through the definition of the concept, the historical development of Latin American populism and the understanding of populism as a communicational phenomenon. Next, the qualitative content analysis method informed by the framework theory and used in this work will be presented. Finally, the results found will be discussed through their contexts and the theory of populism.