The edited volume, Shi'i Islam and Sufism: Classical Views and Modern Perspectives offers new, powerful insights into the long-debated issue regarding the intellectual interactions and mutual influences occurring between Shi'i Islam and Sufi doctrines and practices. Despite the long-standing and extensive body of studies on Sufism and the considerable progresses made over the past few decades in the field of Shi'i Studies, the mutual relationship between Imami Shi'ism and Sufism has been little explored. The present work, thanks to the contributions of some amongst the most renowned scholars in the field of both Sufism and Shi'ism, effectively contributes to build a comprehensive historical picture of these two major currents within Islam, both from a textual and doctrinal point of view. Moreover, by probing political, historical, doctrinal and sociological developments, this volume offers a systematic exploration of the Shi‘i-Sufi relationship. This is attained by looking, inter alia, at the social history of Shi'i-Sufi brotherhoods such as the Ni'matullahiyya, and by analyzing the way the relations between Shi'ism and Sufism have been depicted and perceived in other literary Sufi traditions. Particularly significant is that the present volume also seeks to examine the nature and advance of alternative literature to anti-Sufi discourses in Shi'i pre-modern and modern works.