The Cambridge Companion to Periyar, edited by A.R. Venkatachalapathy and Karthick Ram Manoharan, marks a significant milestone in the scholarly recognition of E. V. Ramasamy “Periyar” as a major intellectual figure of global importance. This review examines how the volume situates Periyar's ideas within wider debates on social justice, political philosophy, feminism, secularism, and postcolonial thought. By bringing together interdisciplinary contributions, the Companion highlights the enduring relevance of Periyar's critique of caste hierarchy, Brahminical dominance, patriarchy, and religious orthodoxy. The review argues that the inclusion of Periyar in the Cambridge Companion series represents an important step in expanding the global intellectual canon beyond Eurocentric frameworks. It further evaluates the editors' success in presenting Periyar not only as a regional social reformer but also as a thinker whose ideas engage with universal questions of equality, rationalism, and human emancipation. Serving both as an accessible introduction for students and a valuable resource for scholars, the volume offers fresh perspectives on Periyar's intellectual legacy and its contemporary significance.