Background: Medical Residency (MR) started in 1889, at the Department of Surgery at John's Hopkins Hospital, in the United States, to assist the development of medical specialties. In Brazil, it was implemented in the 1940s at the Hospital das ClĂnicas of the Faculty of Medicine of the University of SĂŁo Paulo, but it was only in the 1970s that its true expansion took place; however, the admission criteria (AC) in the MR are heterogeneous in this country. Objective: It was to analyze the main AC in MR in Brazil, in order to know the main differences between them and to highlight the most important AC. Methods: An observational study (STROBE rules) was carried out on the evaluation of twenty-seven (27) AC for RM adopted or not by ten (10) institutions in Brazil. As an evaluation criterion, the terms "1 = yes" and "0 = no" were adopted in relation to the adoption of competences. Descriptive statistical analysis, ANOVA-One-Way Test (p < 0.05 with a statistical difference), multivariate analysis and ANOVA-Equality of variances were performed. Results: Table 1 shows the numerical and percentage data of the occurrence of types of admission criteria in medical residency programs. There was a difference between the averages of each Institution in terms of absolute values, as well as a statistically significant difference in relation to the AC of each MR, with p = 0.000 (Table 2