In recent times, increasing instances of population displacement from many large dam construction projects have led to increase in anti-dam protest movements. But some of these protest movements are more successfully mobilized than others. The differences in success are largely due to the kind of political system they are based in. Studies show that formation and mobilization patterns of the protest movements are largely determined by the nature of state and its political system. However, there is lack of comparative study in this regard especially in the field of anti-dam protest movement. This thesis aims to fill that knowledge gap by comparing the anti-dam protest mobilization in Sardar Sarovar Dam, India and Three Gorges Dam, China. The Study finds that political structures have significant impact on anti-dam protest mobilization and citizens of democracy enjoy more freedom in anti-dam protest mobilization than those in authoritarian polity.