The purpose of this thesis is to study the relationship between financial integration, political openness and growth in developing countries. In fact, political reforms and economic liberalization was the slogan of the international financial institutions which conditioned the granting of financial aid to the implementation of certain reforms in favor of democracy and more respect of human rights in addition to more financial integration. Our empirical investigation covers a sample of 108 developing countries between 1984 and 2008 and uses both static and dynamic panel data estimation in addition to the new causality test in heterogeneous panel. Our results show that financial liberalization positively impact growth directly and through indirect channel like Investment, trade and macroeconomic stability. It also favors financial development and promotes human capital. Even though, democracy doesn’t directly influence growth, it has an indirect positive effect on it through favoring international trade in addition to financial and human capital development. Otherwise, political instability negatively affects growth directly but also indirectly through decreasing investment and increasing inflation. Finally, our results suggest the existence of a bidirectional relationship between financial integration and democracy. In the other side, the relationship between financial integration and political stability is more specific and depend upon regionals characteristics of the country.