This thesis seeks to explain how the United Nations in an effort to resolve the civil war that took place in Yemen in 2014-2018. The Yemeni region has in fact become one of the regions in the Middle East that has experienced various conflicts and wars, which has become the main focus of the United Nations in its efforts to resolve the war. Using the theory of International Organizations by Mc. Clelland, can support UN efforts to be able to easily resolve the war in Yemen, using three stages, the first is Conflict Prevention, the second is Peace Making, and the last is Peace Keeping.