In recent years, democratic countries have witnessed the participation of fake news in their deliberative processes. The way it has taken place has varied according to the specifics of the communication structure of each nation. The significant presence of fake news in recent elections has raised concerns about the possibility that these materials are interfering with deliberative processes, causing contexts of disinformation, deception and manipulation of voters, consequently affecting their results. This dissertation analyzes the participation of fake news in the 2016 presidential election in the United States, as well as in the 2018 presidential and 2020 municipal elections in Brazil. It seeks to understand how these contents were used in each of the above contexts, which dissemination mechanisms were used, the approaches adopted, the main issues raised, the extension of their diffusion, the possible influences they may have had and their relevance in each one of those contexts.