Abstract: This study has examined the impact of World Bank, International Development Association and International Finance Co-operation on the Nigerian economy for the period 1990 to 2010. The study uses unit root test to determine the stationary state of the variables using the Augmented Dickey-Fuller Test. It also employs the Johansen Co-integration and Error Correction Model (ECM) statistical techniques to establish both short-run and long run dynamic relationship between the endogenous and exogenous variables. The findings indicate one period lag of World Bank loan enhanced the Nigerian economy; International Development Association Grants and International Finance Co-operation positively influenced the economy of Nigeria in the period observed; though they were not all statistically significant. Premised on this, it is therefore recommended that the Nigerian government put stringent measures/policies to ensure the assistances from these bodies are well utilized to positively enhance the Nigerian economy.