Background and Aim: The Holy Quran has emphasized a lot on ethics and the issue of paying attention to ethics in political decision-making is a very important issue in the political governance of Islam. In such a way that the ultimate goal in politics and governance is to achieve the happiness of the Islamic Ummah, not to achieve domination and power. At the beginning of the Umayyad rule, the grab of power to secure personal and tribal interests became the goal of the rulers' actions and Mu'awiya's actions based on the absence of a two-way relationship between politics and ethics became the model of the caliphs after him. In this way, Umayyad politics under the leadership of Mu'awiyah was a separation between the two categories of politics and ethics. The problem of the present research is to investigate the performance of Muawiyah in relation to the separation of ethics and politics and to analyze the examples of violations of ethics in his policies as the founder of the Umayyad government in the history of Islam. In this regard, we will have a look at the theory of Malik Ben Nabi in the political ethics of the Umayyad era in order to clarify how Muawiya's behavior in the field of action and opinion led to the decline of Islamic governance and was able to regress political ethics in Islamic governance.
Methods: This research is a review, descriptive and analytical study and its data has been provided by collecting research slips from library sources.
Ethical Considerations: The principles of honesty and trustworthiness have been observed in the entire research process.
Results: During the Umayyad dynasty period, especially the period of Muawiya's rule, due to the priority of power over happiness, a constructive relationship between ethics and politics was not established; Rather, in order to gain power, methods contrary to the approach of ethics and politics were adopted.
Conclusion: Muawiya and the Umayyad government in general in the field of Islamic civilization by using anti-ethical methods such as Creating terror, poisoning and terror, lying, falsifying hadith and cultural activities and reproduction of Jahili ideas, caused a negative and inconsistent relationship between ethics and politics in the field of governance.