Natural resource management and documentation of indigenous knowledge as a means to ensure sustainable development is becoming both national and global agenda. The main purpose of the study is to examine the mediating role of indigenous Oromo Gada system in commons management of natural resources. In this study, this particular information gap is interrogated by systematically reviewing various literatures on the critical role of Gada system in institutionalization of natural resource management from a wealthy available literature. It is a meticulous conceptual analysis. The study revealed that Gada system played a significant role for the coexistence of peace, solidarity and unity among Oromo people towards democratization of nature conservation via development of different natural resource management institutions and by enacting different rules and regulations under the Oromo democratic institution: Gada system.