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This paper investigates the threshold effects of income inequality on economic growth in developing countries for the period of 2000 to 2012, using Panel Smooth Transition Regression (PSTR) model. The linearity test results indicate strongly nonlinear relationship among variables under consideration. Moreover, considering one transition function and one threshold parameter, as a two regime model, is sufficient to specification of nonlinear relationship among variables. The results indicate that threshold value for developing countries is 0.43 and the estimated slope parameter is 0.35. In the first regime the impact of income inequality is positive and in the second regime has a negative impact on economic growth. human capital in the both regimes has symmetric and consistent effect on economic growth. Other results indicate that population growth and trade openness had been asymmetric effect on economic growth in the both regimes. [ABSTRACT FROM AUTHOR]