Income inequality isn't new thing, but recently it has made it presence in news, political discussions etc. It has now become the key and defining challenge of our time. Both the developed and developing countries have reported massive amount of income disparities within their respected countries. In this paper we study the links and effects of the macroeconomic variables especially economic development and financial development on income inequality. We restrict our study to OIC countries. Simon Kuznet hypothesis is taken as the theoretical basis for this study ...