The present study aims to evaluate the impacts of behavioral and organizational factors on decisions related to the inclusion of sustainability criteria in public procurement in the Brazilian public sector. Based on the theoretical lens of behavioral strategy and sustainable public procurement, data from the survey (Survey) and bibliographic and documentary research were related. Thus, the variables extracted from the literature and selected through Exploratory Factor Analysis were identified. Then, Cluster Analysis and the MANOVA and ANOVA techniques were used, which made it possible to verify that the Executive Power bodies tend to consider Control as the least important organizational factor and Training as the most important in relation to the other factors of the category - behavior observed in most state and municipal agencies. On the other hand, it was noticed that there is a tendency in federal institutions to consider Control as the organizational factor that most impacts decisions on the inclusion of sustainability criteria in public procurement, while, for this group, the variables Cost, Training and Standards are the ones with the least impact. With regard to behavioral factors, there is a greater tendency of Executive institutions and a large part of state and municipal institutions to consider the variables Availability Bias, Biased Behavior and Status Quo Bias as the most impacting on sustainability decisions in public procurement compared to the institutions of the Judiciary, Public Prosecutors Offices and Courts of Accounts. Finally, it was also possible to observe that the institutions of the Executive and most of the state and municipal institutions tend to emphasize organizational and behavioral factors more than the institutions of other powers and other federative entities.