Great Revolutions, as great international developments, lay emphasis on universal ideas which aim at extra-national and extraterritorial objectives to redeem mankind. These revolutions by offering the idea of redemption and liberation of mankind, announce to the world that liberation and redemption from the existing undesirable condition is on their agenda and by materializing this great goal they will present felicity and happiness to human societies. The present article is an attempt to comparatively study the liberation ideas in the three great revolutions in France, Russia and Iran to find out their similarities and differences. The main question of the present research is: What are the conceptual differences and similarities between redemptive ideas of the three great revolutions? In order to provide answer to this question, the main features of great revolutions will be explained in the light of the conceptual framework of millennialism as well as their redemptive ideas as their ideological and pragmatic sources. The hypothesis of this research is: All great revolutions, despite their fundamental ideological differences, have relatively similar ideas in the field of redemption of mankind.