Statement Of Problem: As a body with focus and objectives, it is only natural that stakeholders and other societies will be willing to have accurate and adequate information about the Jama'at's activities and its legacies which as at now are not available in one volume. To fill the gap by providing a well documented work at a high level of research on a prominent Islamic Organization in Nigeria named Jama'at Nasril Islam. Abstract: A lot has been written about the advent and development of Islam in Nigeria. Not much attention has been given to the contributions of indigenous Organization that served as major vehicles for its propagation. The Jama'at Nasril Islam (JNI) which was founded in 1961 by late Sir Ahmadu Bello, the Sardauna of Sokoto, is One of such Organizations. The methodologies adopted in this work included the historical and descriptive Procedures. Also, Primary and Secondary sources were used, including Oral interviews of relevant stakeholders as well as Library andarchival materials. This research were to evaluate the efforts of the JNI towards the development of Islam in Nigeria. Also, the work examined the impact of the activities of the JNI on the Muslim Ummah.