Sheikh Tusi is among the famous and prolific scholars of the fourth century AH. In the fields of exegesis, he is one of the founders of the Shi'i ijtihadi exegesis. This research, using a descriptive-analytical method, seeks to examine the principles and criteria of ta'wīl from Sheikh Tusi's perspective. The investigation shows that from this scholar's viewpoint, ta'wīl is more specific than tafsīr. The criterion for the acceptance of ta'wīl from his perspective is the consensus of the exegetes and its non-imitative nature. A systematic ta'wīl is one that has authentic linguistic, historical, hadith-based, and narrative evidence. Through the study of Sheikh Tusi's ta'wīl—especially in his commentary on the Qur'an—one can comprehend his rational logic in understanding religion. He places ta'wīl within the framework of reason, the rules of the Arabic language, authentic tradition, and definitive evidence. His principles prevent arbitrary interpretations and have a foundational role in Shi'i exegesis. This research shows that re-reading Sheikh Tusi's principles of ta'wīl can be constructive for the contemporary understanding of the Qur'an and Shi'i hermeneutics and help exegetes to establish a balance between the outward (ẓāhir) and inward (bāṭin) aspects of the verses. His principles still serve as an authoritative and inspiring reference in exegetical studies.