Introduction
The concept of justice and ethics in warfare has been a prominent topic in Islamic thought, and numerous Muslim thinkers have explored this subject. One of the most notable among them is Al-Farabi, a leading Islamic philosopher and a founder of Islamic political philosophy. Through his theory of the Virtuous City, Al-Farabi outlined foundational principles for human societies in which goodness, justice, and virtue stand as core values. This paper aims to examine Al-Farabi's perspective on "just war" through the lens of his political philosophy. The primary question of this research is: How does Al-Farabi justify the concept of just war? Does his acceptance of the concept imply the existence of unjust wars?
Questions and Hypotheses

From Al-Farabi’s perspective, what qualifies a war as just?
What are Al-Farabi’s criteria for distinguishing just from unjust wars?
Does Al-Farabi view war as a legitimate tool for expanding political power and influence?

The main hypothesis of this study is that Al-Farabi considers war justifiable only under certain conditions, as a means to achieve good and justice. Any war aimed at personal gain, conquest, or the expansion of power, however, is deemed unjust by Al-Farabi.
Research Methodology
This study is based on a library-based examination of primary and secondary sources, focusing on Al-Farabi’s works such as The Opinions of the People of the Virtuous City and various interpretations of his thought. The approach employed here is descriptive-analytical, supported by hermeneutic interpretation of Al-Farabi’s texts to elucidate his foundational principles on the just and unjust nature of war.
Main Body

The Concept of Justice and Goodness in Al-Farabi’s Thought

Al-Farabi holds that justice is one of the foundational values necessary to create an ideal society. In his view, the "Virtuous City" is a society in which justice and goodness reign supreme, and citizens strive toward achieving virtue and perfection. For this reason, Al-Farabi views any action, including war, as justifiable only if it serves to establish justice and promote the common good.

War in Islamic Thought and Al-Farabi’s Perspective

In Islamic thought, war has consistently been seen as a last resort, acceptable only for resisting oppression and tyranny. Islam’s ethical principles endorse war solely under circumstances that defend human rights and eradicate sedition and aggression. In Al-Farabi’s view, war is considered just only if it aims to protect individuals from oppression and to secure public good. He categorically rejects any war waged for revenge, territorial conquest, or material gain. In other words, Al-Farabi holds that war must be a means to create a better and more just society rather than a tool for personal or group advantage.

Criteria for Just and Unjust Wars in Al-Farabi’s Thought

Al-Farabi provides clear criteria for distinguishing just wars from unjust ones. According to him, war is only justified if it is aimed at achieving goodness and justice. These criteria include respecting the lives of citizens, preventing cruelty, and establishing justice in society. Al-Farabi insists that war must solely be waged against oppression and corruption and should ultimately foster peace and security for all citizens.

War as a Tool for Advancing Virtue in Society

Al-Farabi views war not only as a defensive measure but also as a potential tool for advancing virtue and the public good. He argues that if a society is at risk of losing justice and virtue, then a war aimed at restoring these values can be deemed necessary and beneficial. For this reason, Al-Farabi differentiates between just and unjust wars, supporting only those that benefit the general public and uphold justice and virtue.
Conclusion
Al-Farabi’s theory of just war presents a moral and philosophical framework wherein war is permissible only as a means to establish justice, eliminate oppression, and secure the common good. According to Al-Farabi, any war conducted for the sake of personal gain, expansion of power, or ambition is inherently unjust. He introduces this theory as part of his philosophy of the Virtuous City, where he emphasizes the importance of the goal and purpose of war in determining its moral validity. In Al-Farabi's thought, a just war must be directed toward promoting, distributing, and ensuring virtue and welfare; otherwise, it devolves into an unjust war.