This paper examines the impact of external debt on the growth of the Nigerian economy between 1990 and 2018 with a view to drawing key implications for the management of the economy. Having ascertained that the variables of the study are non-stationary in levels but stationary after first differencing and also being cointegrated, error correction model (ECM) technique was used for the analysis. The pairwise Granger causality test results show that while a one-way causal relationship exists between fiscal balance and external debt with the causality running from fiscal balance to external debt, no causal relationship exists between external debt and real output. From the short run ECM and long run models, it was found that a statistically in...