The article proposes the creation of transparency indicators for parliamentary ombudsmen based on the mapping of transparency instruments contained in Law No. 12.527 / 2011 and Law No. 13.460 / 2017. The study suggests an adaptation of the indicators of the Transparency Index of the Legislative Power, a methodology produced by the Federal Senate, for greater coverage of the activity of parliamentary ombudsman. In addition, it presents the results of the application of the index in the ombudsman offices of the Chamber of Deputies and the Federal Senate, drawing a comparison between them, and proposing future assessments that have the object of state and municipal parliaments.