Lisān al-Mīzān is a distinguished and widely discussed work in the science of Asmāʾ al-Rijāl (the study of narrators), authored by the eminent scholar Al-Ḥāfiẓ Ibn Ḥajar al-ʿAsqalānī (may Allah have mercy on him). This article aims to introduce this seminal book, examine its methodology and stylistic features, and provide a detailed account of its structure and approach to assessing narrators. It also explores the manuscript and printed versions, deciphers the symbols and annotations used by the author, and highlights the foundational principles employed in evaluating narrators. The study identifies instances where the author deviated from his established principles, offering clarifications for specific terms and contexts when necessary. Additionally, the reasoning behind the book's title, its primary sources and references, and potential areas for further refinement are thoroughly discussed. By addressing these facets, the article seeks to make the study of Lisān al-Mīzān more accessible and engaging. In conclusion, the article aspires to leave no dimension of Lisān al-Mīzān unexplored, fostering a deeper appreciation for the work and equipping readers with the tools to navigate its content with ease and enthusiasm.