One of the basic underpinnings of the Islamic state, which is somehow in the domain of Islamic governance, is the principle of justice. The Quranic verses have clearly addressed the principle. This issue also has a special place in the political thought of Imam Ali (AS) and its most striking appearance has been found in Nahj al-Balaghah. The purpose of this paper is to examine the semantic scope of justice in the verses of the Qur'an and the traditions narrated from Imam Ali (as) is in Nahj al-Balaghah. After examining the meaning of the word and the definitions that exist for this term, the basic principles of justice have been discussed from the point of view of Islam and Nahj al-Balaghah, from the point of view of Imam Ali (as) Recall.