From the mid-1990s onwards, several institutional reforms and regulatory and legal revisions that took place in Brazil led to a wave of bank mergers and acquisitions (M&As). As a result of this process, the level of banking concentration in Brazil has become one of the highest in the world. The objective of this research is to try to highlight the effects of bank competition on credit in Brazil through the study of data from three of the main M&A events that occurred after the Plano Real. The differences-in-differences (DD) model, developed by Joaquim, Doornik and Ornelas (2019), was used to estimate the effect of competition on credit variables. Under the identification hypothesis that in the absence of an M&A episode in a local banking market the results between exposed and unexposed municipalities will be similar, treated markets were considered those with at least one branch of both banks involved in the M&A episode. By replicating the results of Joaquim, Doornik and Ornelas (2019) DD model for the case of Itaú-Unibanco, using only publicly available data, and the M&A episodes between Santander and ABN AMRO Real (2007) and Bradesco and HSBC (2016), it was evidenced that a reduction in bank competition through private banks implies a reduction in private banks loans and that the trajectory of private credit has little effect on public banks. In addition, it was observed that the geographic presence of banks, or the number of branches spread across Brazil, does not interfere in these results.