As every war, the civil war of 1967-1970 in Nigeria has had a negative impact on economic activity. This study examines the movement of some economic variables during the war, and their relationship to government policies. Furthermore, the decline of certain sectors of the Nigerian economy is outlined. Finally, the author suggests a few measures to reintegrate the war-affected areas in the country’s economy. Parts of the article: Political sketch – Output, prices, and employment – Monetary and fiscal policies – The balance of payments – Major sectors affected by the war (oil, manufacturing, transportation, domestic trade, agriculture) – The Biafran economy – Costs and benefits of the war – Post-war problems and priorities. Notes. See also: Journal of Modern African Studies, vol. 11, no. 3 (1973), p. 460-463: F.S. O’Brien. The economic impact of the Nigerian civil war: a comment, with a reply by E.W. Nafziger.