This book examines the conceptions of justice from Zarathustra to Islam. The text explores the conceptions of justice by Zarathustra, Ancient Egypt, India, Mesopotamia, Noah, Abraham, and Moses. During the Axial Age (800-200BCE), the focus of justice is on India, China, and Greece. In the post-Axial age, the focus is on Christianity. The authors then turn to Islam, where justice is conceived as a system, which emerges if the Qur'anic rules are followed. This work concludes with the views of early Muslim thinkers and on how these societies deteriorated after the death of the Prophet. The monograph is ideal for those interested in the conception of justice through the ages, Islamic studies, political Islam, and issues of peace and justice. It considers various theories of justice from the pre-Axial Age to Islam; offers a historical overview of the conception of justice through religion; and examines two schools of thought: Zarathustra and Islam and their conception of justice.