The problem addressed by this study is the explication of the convergences and divergences between two mystical experiences: fanā (self-annihilation) in the tradition of ʿAṭṭār Nīshābūrī and satori (awakening) in Zen Buddhism—two traditions which, despite their geographical distance and lack of historical contact, both regard "nothingness" and "self-effacement" as the precondition for attaining truth. The aim is to offer a structural comparison of these two concepts and to demonstrate how two independent religio-mystical experiences converge in the realm of the "ineffable." The research method is comparative-analytical, employing a "critical dialogue" framework. On the one hand, it analyzes four concepts in ʿAṭṭār's works—"nothingness" (faqr, as an equivalent to Śūnyatā), "perplexity" (ḥayrat, as an equivalent to the Zen "Great Doubt"), "silence" (khāmūshī, as an equivalent to the "ineffable"), and "subsistence after annihilation" (baqāʾ, as an equivalent to the Zen "ordinary mind")—and on the other, it compares these concepts with classical Zen teachings drawn from Huang Po, the Platform Sūtra, and Suzuki. The findings reveal that both traditions view everyday existence as "delusion" and "duality," seeking the path to liberation through the "dissolution of the self" and a "sudden leap" toward the unitary truth. Nevertheless, significant divergences emerge: in ʿAṭṭār, fanā results from a "long spiritual journey" and the amorous "pain of separation," culminating in "subsistence after annihilation" (baqāʾ baʿd al-fanāʾ), whereas in Zen, satori is "effortless" and "sudden," and the concept of "subsistence" therein signifies a return to "ordinary mind" and everyday life.