At the start of the Yemeni Civil War in September 1962, Yemeni revolutionaries, led by Abdullah Sallal, overthrew Imam Muhammad al Badr, who rallied Zaydi tribal supporters to their northern highlands stronghold. Within days of the revolution, Egyptian troops arrived in Yemen in support of the revolutionaries with Soviet supplied munitions and recognition of the Yemen Arab Republic (YAR). Fearing Egyptian President Gamal Abdul Nasser’s ulterior motives of Arabian oil conquest, Saudi Arabia gave refuge to the deposed Yemeni Imam, and provided his followers with military and financial assistance, thereby declaring support for the royalists. From the vantage point of the port of Aden, the British supported anti-Nasser royalists in defense of colonial interest in Arabia and to the ire of the United States. Three months into the conflict, in December 1962, the U.S. recognized the YAR, thereby further drawing local events in Yemen into the global arena and Cold War competition. Hostilities in Yemen continued until 1968 during which Egypt, Saudi Arabia, the U.S., the USSR, Britain, Canada, Israel and the UN invested military, economic, and political capital to manipulate local events. I argue that the ramifications of global participation in the Yemeni Civil War greatly impacted regional power politics in the Middle East and Cold War alliances globally. The Yemeni Civil War is a prime candidate for an international history that redefines regional events by broadening source bases, language breadth, and geographical boundaries. I combine the numerous perspectives of the countries and national grand strategies competing in the global arena of this localized conflict allow in a comprehensive analysis of the multilayered interactions of the parties involved. How did local events on the ground in Yemen affect the global alliances of the Cold War, the Arab World, and the non-aligned nations? Using International Relations statistical and theoretical analyses including a discussion of civil wars as a post-colonial phenomenon, the effectiveness of diplomacy and intervention in regional civil wars, and the reasoning behind the decision to participate in a civil war, I discuss a number of important thematic questions: At what point does a post-WWII local civil war turn international and can it still be called a civil war? What varying motivations draw international participants into a civil war? Does international participation prolong or shorten the duration of hostilities? What precedent and lessons does the Yemeni Civil War leave for future internationalized civil wars?