Abū al-Qāsim al-Qushayrī (376–465 AH / 986–1072 CE) was one of the foremost scholars and Ṣūfī masters of fifth/eleventh-century Khurāsān. Born near Nīshāpūr, he studied under many of the leading scholars of his age and became an authority in Shāfiʿī jurisprudence, Ashʿarī theology, ḥadīth, and taṣawwuf. He is best known for his celebrated al-Risāla al-Qushayriyya, a foundational treatise that articulated the principles and terminology of the Ṣūfī path while firmly grounding them in the Qurʾān and the Sunnah. Through this work and his teaching, al-Qushayrī played a significant role in demonstrating the harmony of Sunni orthodoxy and Ṣūfī spirituality. Among his other major works is Laṭāʾif al-Ishārāt, a renowned Qurʾānic commentary that combines outward exegesis with spiritual reflection. Revered by later generations as both a scholar and spiritual guide, al-Qushayrī's writings continue to be widely studied and have exerted a lasting influence on Islamic thought and practice.