This article presents a systematic review of peer-reviewed literature on Indigenous participation in global environmental governance (GEG) forums, such as those held by the United Nations. It explores which forums include Indigenous participation and how Indigenous perspectives are integrated or excluded in governance discussions and decisions. The review identifies seven key themes: critical governance forums, inclusion and exclusion of Indigenous voices, capacity barriers, knowledge hierarchies, representation of Indigenous peoples, the need for networks, and Indigenous influence on decisions. The findings aim to enhance GEG forums by addressing barriers to meaningful Indigenous participation and guiding future research on Indigenous experiences in these settings.