The concept of justice in the thought of Imam Khomeini (RA) is one of the most fundamental concepts that has a decisive presence in the personal, moral, social and political spheres. This research, with an analytical-philosophical approach, examines the foundations and various dimensions of justice in his thought and shows that justice is not just a legal or political principle, but is rooted in anthropology, ethics and teleology of human life. In this framework, individual justice is considered as the balance of self-powers, internal refinement and establishment of virtue, a prelude to the realization of justice in the social arena. According to Imam Khomeini (RA), a just society is formed when the political structure and social relations are organized based on the rejection of oppression, respect for human rights, and adherence to divine values. The findings of this research show that justice in Imam's thought is a continuous and multi-level concept that starts with the self-improvement of the individual and extends to the establishment of a just social and political order. Based on this, the relationship between individual justice and social justice in his thought is an inseparable and evolutionary relationship; In such a way that without human reformation, sustainable social justice cannot be achieved, and without a fair structure, the ground for human moral growth will not be provided.