The domestic endorsement and institutionalization of transparency is of central importance to the implementation of global environmental policies. Studies often contend that interaction with international organizations (IOs) promotes domestic support for transparency. This article qualifies this conclusion and suggests that the positive effects of interaction with international organizations depend on the quality of IO decision-making processes, defined as their fairness, predictability, and effectiveness. Unfair, ineffective, and unpredictable decision-making processes in IOs can increase corruption, reduce legitimacy, and make officials blame transparency for unsatisfactory decision-making. The results build on a study of government officials in developing countries responsible for managing funds from the Clean Development Mechanism and the Multilateral Fund for the Implementation of the Montreal Protocol. Our findings suggest that government officials who perceive IO systems as unfair, ineffective, and unpredictable cultivate an adversarial relationship with media and NGOs and become more critical of the benefits of transparency.