Currently, ethnic tension and conflict are serious problems in Ethiopia. The problem of national unity is inevitable in countries like Ethiopia in which it is comprised by various cultural, religious, ethnic and regional groups. However, religious institutions play undeniable role in promoting Ethiopian unity. They have been participated in reconciliation activities by mitigating conflict and prayed on the basis of their divine mission. EOTC and Islam which were the focus of this study play a role in bringing Ethiopian unity. They are the very prominent religions in terms of history and number of followers they have in Ethiopia in general and Bahir Dar city administration in particular the study area of this research. The central objective of this study was to assess the role of the two dominant religions, EOTC and Islam in promoting Ethiopian unity. This research used qualitative research method through case study research design by consulting primary and secondary data. The research was framed by functionalism theory with the paradigm of social constructivism. Focus group discussion, and semi structured interview were the main data gathering instruments and data were collected from Bahir Dar city administration Ethiopian Orthodox Church, Islam religion institutions and ANRS Interreligious Council. The conclusion that is drawn from the finding of the study revealed that, EOTC and Islam religion have a vital role in creating a sense of belonging and relation among Ethiopian society irrespective of ethnic, religious, regional and other differences. Preaching, praying and reconciliation are among the activities that both EOTC and Islam perform. They have a great acceptance by the citizens of Ethiopia. Hence, they have a power in promoting Ethiopian unity. However, due to the existence of different problems, they are challenged to contribute their expected role. The government does not use them as a prerequisite is one challenge among