This volume examines the origins and development of Islamic mysticism, including its dialogues with other faiths. By highlighting key figures—from Shaykh Ṣafī al-Dīn Ardabīlī to post-Ṣadrā movements—it maps the growth of diverse mystical traditions within Islam and then moves on to survey Sufism’s spread to North America and Europe. In its conclusion, the book challenges the prioritization of outward ritual over inner spiritual reflection and offers a nuanced portrait of how Islamic mysticism has persisted in Muslim societies and has been rearticulated in contemporary Western contexts.