The article attempted to identify, explain and interprets the multidimensional security repercussion of ethnic political conflicts in Ethiopia on the neighboring countries in the period 1991-2018. The study specifically focused on the conflicts between the regime in power and Oromo/Somali ethnic based rebel groups. Key informant interview and FGD were employed to gather primary data which was substantiated by secondary data. The obtained data was analyzed using concepts of international dimensions of internal conflict viewed from African international relations perspective. In the period, armed conflicts between Oromo/Somali insurgent groups and the government kept the neighboring states on political instability, hostile state relations, economic insecurities, and refugee and small arms transfer. In the Horn of Africa, ethnic political conflicts could spill over and challenge the neighboring state’s internal affairs as well as the good neighborhood. Similarly, distancing Oromo and Somali nations from the political scene of Ethiopia could destabilize Ethiopia and the neighboring states.

Keywords: Ethnic Conflict, Neighboring states, Conflict Implications