The basic contention of this study is that the colonial rule had far more serious consequence than it has been realized. It radically transformed the nature of the Islamic societies of Egypt and Muslim India to that of an 'Islamicate'societies. This affected the religious, cultural, social, and legal aspects including ethnic and minority relations, gender relations and even their educational system. The phrase 'Islamicate' is here borrowed from Marshall Hodgson, who used it in his The Ventures of Islam to indicate the changes that took place due to the modernization under the impact of the West and colonial rule. However, our investigation takes it into a different direction, demonstrating how and what ways this phenomenon of the 'Islamicate' has changed the Islamic identity of Egypt and Muslim India. This study analyzes varied aspects such as religious, social, cultural, legal, and other aspects of the Egyptian and Muslim Indian societies through the mechanisms of change that the colonial rule brought to them.