Revista de Administração, v. 52, pp. 26-35. Abstract: The main objective of this paper is to assess the degree of maturity of Brazilian accredited hospitals in relation to sustainable practices, specifically the environmental dimension. Therefore, a questionnaire was constructed, shaped by the literature review and the evaluation method of the Corporate Sustainability Index of BM and FBovespa (n.d.). Furthermore, the relationship between three corporate sustainability tools (the certification of the International Organization for Standardization [ISO] 14001, published sustainability reports, and the existence of an area dedicated to corporate sustainability) and the maturity of hospitals in relation to sustainability practices were assessed. The results show that, of the 38 hospitals that participated in the survey (43% of subjects studied), 58% obtained a maturity rating of very high or high rating, according to the established criteria. In addition, some research variables showed statistically significant differences among the hospitals that have ISO 14001 certification, those that publish sustainability reports, and those that have an area dedicated to sustainability. Consequently, hospitals should take action to include much more sustainability actions in their strategies, such as how to establish a participatory dialog with stakeholders, in order to improve and raise the level of maturity of hospitals.