Nigeria belongs to a comity of nations which means that she is not an island. The 30 months civil war which occurred between 1967 and 1970 exposed the fragility of her foreign policy with other countries of the world. There is the need to re-examine the impact of the civil war on Nigeria’s foreign policy. The objectives of this research is to: Analyze the major events that took place outside Nigeria during the civil war and how it changed the way Nigerian leaders conduct external relations. The study relied much on primary sources especially government publications, correspondence and interviews. The study revealed that the various ethnic groups in Nigeria need one another; so also, that Nigeria should harness the lessons of the civil war to build her foreign policy with other world countries, especially in the West African sub-region.