There is widely accepted concept in economic theory that human capital plays positive role in determining national income. Formation or accumulation of human capital and economic development for human welfare are the major targets of economic policy of each country. This study investigates the casual relationship between economic development and formation of human capital in Pakistan. Based on endogenous growth theory, this study empirically test the standard growth model consisting of Gross Domestic Product (GDP) per capita as a dependent variable and human capital formation, investment in physical capital and labor force as independent variables. Auto Regressive Distributive Lag (ARDL) bound testing approach to co-integration is used to check the long run equilibrium relationship between the variables included in the model. For checking the causal relationship between economic development and human capital formation, Pair-wise Granger Causality test is utilized using the time series data ranging from 1972 to 2009. The results of the co-integration show that the variables are co-integrated. They have long run stable equilibrium relationship. The results of the causality test show that there is bidirectional causal relationship between economic development and human capital formation.