Nationalism is perhaps one of the most controversial terms in international political history. It has many different meanings and definitions, and its impact on human history also has opposite meanings: Nationalism plays an important role in the formation of modern nation-states, is a driving force against foreign invasion, gaining and maintaining the independence and sovereignty of many countries in the world, but its extreme forms are also the cause of many conflicts between peoples, peoples of different sizes and nature. Since the end of the Cold War, nationalism has risen sharply. It is accompanied by the emergence of manifestations of extreme nationalism - one of the causes of internal conflicts in some multinational states and conflicts between several nation-states. These conflicts challenge the stability and development of a country and threaten world security.

In the world today, being one of the few countries still choosing the path of communism and a multi-ethnic country with a community of 54 ethnic groups with a long history of resistance to foreign invasion, it is difficult for Vietnam to avoid arising problems related to nationalism. If positive nationalism has always been a strong motivation to unite ethnic groups in Vietnam, creating strength to defend national independence and national sovereignty of Vietnam.Some manifestations of the so-called extreme nationalism also appeared in Vietnam. In this study, the situation in Vietnam should be named “excessive nationalism”. In fact, Vietnam has nationalism, but the manifestations of nationalism are sometimes a bit beyond the normal level but cannot be called extreme. This only happens to a small number of people due to provocation and exploitation. This case has not become a trend or climax that can be considered extremism, but just slightly exceeds the level of true positive nationalism.

The manifestations of excessive nationalism in Vietnam have characteristics that need to be properly identified, their causes need to be clearly explained, and the negative impacts they cause need to be thoroughly analyzed so that the country's leaders and the people themselves can behave appropriately. Vietnam is deeply and widely integrating into the world; its position and influence are increasingly strengthened in the region and the world. The study of the manifestation of excessive nationalism in Vietnam is also of international reference value.