Introduction In a world of international communications and interactions, cities are studied as geographical regions within an atmosphere of streams built upon direct connections between cities (Najati Hosseini, 2011). In other words, cities play a significant role in the global politics, economy, and the restoration of global management. In the globalization age, cities can be introduced as key players within the frameworks of decentralization policies and interactive actions between cities and provide the means for increasing interactions in areas including information technology, economy, society, and culture (Acuto, 2012). Therefore, in today’ s world, the development and progress of cities highly depend on communications and interactions between them at a transnational level. In fact, modern cities are regarded as spatial-geographical territories that enter transnational interactions and assume international roles. The subject of urban diplomacy is a tool used for studying the role of urban geographical regions in international interactions. Urban diplomacy can be defined as institutions and processes through which cities serve the purpose of demonstrating their capacities and interests in one another in relation with other actors as well as within international politics (Pluijm & Melissen, 2007). During the past few years, Mashhad metropolitan area has managed to take a bold step in the direction of growth and development at both national and international levels through progress in areas such as industry, science, tourism, etc...