Abstract
In this study, Ali Avcu's book Ismāʿilism in Khurāsān–Transoxania was tried to be reviewed. In his book, Avcu deals with the issue of Ismāilism, which we can call a unique form of the innate way of thinking, which has a great influence on the history of Islamic thought. The work was restricted to Khurāsān–Transoxania, and the entry of Ismāilism into the region, the development process, and the understanding of faith were examined. In the work, the geniuses who were sent to these regions to spread their ideologies and their works are also mentioned. Important names such as al-Nasafī and al-Sījīstānī who blended the Ismāilī teachings with the new Platonism were pointed out. It is a valuable study as it assumes as a guide for researchers who want to study the subject.