The essential drive of this article is to deal with indigenous moral system of conflict resolution among the Arsi Oromo with particular emphasis on Guma moral system in Shashemene City of Oromia regional State. To realize its intended objectives the study employed qualitative research approach. Relevant data for this article were collected from both primary and secondary sources. Tools such as key informant interview, focus group discussion, and non-participant observation were utilized for collecting primary data depending on the objectives of the study. The data obtained from both primary and secondary sources were organized thematically and analyzed qualitatively. The findings of this study reveal the existence of different indigenous moral system among the study community including Guma system. Guma as indigenous moral institutions of conflict resolution are functional in conflicts which involve homicides. Lastly, the findings of this study verified that a conflict arises from different sources in Arsi Oromo community of Shashemene city are a collective concern of the community. Therefore, the mechanisms to regulate the breakdown of shared norms and values and ensure social cohesion and collective sentiments as a basis of social order and harmony is through social structures of moral system. This holds true to Arsi Oromo where the social norms, values and institutions are important in regulating the social tensions, stresses and strain emerged in the community as a result of conflicts by creating consensus among its members at large based on the findings of the study.

Keywords : Guma, Indigenous Moral System, Conflict Resolution, Arsi Oromo.