Ethics is part of philosophy that relates to the good and bad values of moral actions. In the history of philosophical thought that began in Ancient Greece, In history of philosophical thought that began in Ancient Greece, ethics is inseparable from the attention of Greek thinkers. This also affected the thinkers afterward, especially in Islamic philosophy. This connectedness becomes a relay of thought that continues to roll so that Islamic thinkers also give full attention to ethics because it is related to human life directly. Many Islamic thinkers have shaped ethical concepts. One of them is Muhammad Ibn Zakariyya ar-Razi He is a leading doctor, a scientist, and a philosopher who is very intelligent and productive. In this case, the concept of ethical ar-Razi. at least three schools greatly influence the ethical concept of thought. Among them; Epicureanism, which tends to psychic issues, Aristotelianism, with the concept of a balance between extreme points (ta'dil al-af'al-nufus), and naturalism, which emphasizes all the criteria of good and bad moral actions under human nature itself physically and mentally. All the three merged into one to form a new ethical concept with ar-Razi’z originality thinking.