The Ismailis are one of the largest Muslim minority populations of Central Asia, and they make up the second largest Shiʿi Muslim community globally. First emerging in the second half of the 8th century, the Ismaili missionary movement spread into many areas of the Islamic world in the 10th century, under the leadership of the Ismaili Fatimids caliphs in Egypt. The movement achieved astounding success in Central Asia in the 10th century, when many of the political and cultural elites of the region were converted. However, a series of repressions over the following century led to its almost complete disappearance from the metropolitan centers of Central Asia. The movement later re-emerged in the mountainous Badakhshan region of Central Asia (which encompasses the territories of present-day eastern Tajikistan and northeastern Afghanistan), where it was introduced by the renowned 11th-century Persian poet, philosopher, and Ismaili missionary Nasir-i Khusraw. Over the following centuries the Ismaili movement expanded among the populations of Badakhshan, reaching a population of over 200,000 in the 21st century. In the 19th and 20th centuries, the Ismailis suffered a series of severe repressions, first under local Sunni Muslim rulers and later under the antireligious policies of the Soviet Union. However, in the decades since the end of the Soviet period, the Ismailis of the region have become increasingly connected with the global Ismaili community and its leadership. While many aspects of the history of Ismailism in the Badakhshan region remain obscure and unexplored, the discoveries of significant corpuses of manuscripts in private collections since the 1990s in the Badakhshan region have opened up wide possibilities for future research.