Given contrasting evidence in the literature pertaining to the impact of Foreign Direct Investment on the host countryís economy, we take the case of Pakistan and test the said association for this nation. The data used for this study has spanned over the period of 1981 till 2010. Besides FDI, four other variables including Debt, Trade, Inflation and Domestic Investment have been included in the study, to regress upon GDP of this country. The methodology to test the impact of these variables on Pakistanís economy has been limited to the least squares method. The co-integration of the variables has been ascertained through application of Augmented Dickey Fuller Test and is found to hold in the long run. Our findings indicate that Pakistanís economic performance is negatively affected by foreign investment while its domestic investment has benefitted its economy. Moreover, the nationís debt, trade and inflation have found to have negative impact on its GDP.