This chapter addresses the right of access to information, reinforced as a fundamental rule for citizens in the Brazilian constitutional norm of 1988, now regulated, more closely, from the enactment of the law on access to information in 2011. It represents an important legislative instrument of reinforcement of the principle of publicity, as well as the main infraconstitutional standard guaranteeing access to information. The requirement of a clear and transparent accountability environment by the public manager is a republican assumption of massive participation by society. This is because the right of access to information of a public nature provides a better control of public expenditures, while allowing, on the other hand, promotion of social control of a diffuse nature. It should be pointed out that, with greater knowledge of their own rights, the citizen goes through a faster inclusion process, either in the subjectivation of a minimal role of rights that he does not know, or in the clarification of his duties as a participant in the process of state maintenance.