This research analyzes the coherence of the European Union through reflecting upon a theoretical framework (integration and disintegration theories) and a practical case study (the Euro crisis, Brexit, and corona virus). The coherence of the European Union produced a massive debate among scholars of political science. Some scholars argued that these crises have deepened the bonds of integration among European member states; others argued that these crises led to disintegration in many aspects of the European Union.The research is divided into three major theses. The first thesis tackles the primary integration theories and the contributions of the political thinkers who are seeking to formulate disintegration theories. The second thesis investigated the development of the integration process within the EU and the crises that faced it from 2008 till 2020. The third thesis is concerned with the application of some integration theories and disintegration assumptions on the crises. The research concluded that there were some disintegrative indicators within the three crises which could contribute to the formulation of a disintegration theory to the European Union.