The Agni Purana is generally recognized as one of the eighteen Mahāpurāṇas, primarily associated with religious teachings, rituals, and mythology. However, beyond its theological dimensions, the text contains significant reflections on kingship, law, governance, administration, justice, and public welfare, making it an important yet understudied source of ancient Indian political thought. This article examines the concepts of religion, law, and the state in the Agni Purana from a political-theoretical perspective. It argues that the text presents an integrated model of governance in which Dharma functions as the ethical foundation of political authority, law serves as the institutional mechanism for maintaining justice and social order, and the state operates as the guardian of public welfare and moral governance. The study further explores the ideas of Rajadharma, Dandanīti, administrative organization, judicial impartiality, ethical leadership, and social responsibility, highlighting their relevance to contemporary political concepts such as the Rule of Law, Good Governance, Welfare State, Ethical Governance, and Political Legitimacy. Adopting a qualitative and textual-analytical methodology, the article demonstrates that the Agni Purana is not merely a religious scripture but also a sophisticated political text that contributes significantly to the intellectual history of Indian political thought. The study concludes that the political philosophy articulated in the Agni Purana continues to offer valuable normative insights for contemporary debates on governance, justice, and ethical statecraft.