The migration of African, Asian and Arab populations in 2015 caused serious security, humanitarian and public health issues for the European Union and for all countries on the migration routes. The migration crisis, as an unplanned, unpredictable and uncontrolled situation, required effective management at the national level. This diploma thesis examines the communication infrastructure of the executive power of the Republic of Croatia during the migration crisis in 2015. The subject of this paper is the analysis of crisis communication of the crisis headquarters of the Government of the Republic of Croatia and the Ministry of Health. With the information obtained from the content analysis and in-depth interview, the paper sought to contribute to the understanding of crisis communication at the highest state level. Based on the research questions, the paper examines the way in which the executive power formalized the communication infrastructure, the existence of a crisis management plan, as well as a crisis communication plan, and key channels and tools used during the migration crisis. The results of the empirical research confirm the existence of a crisis management plan, however, not as a document created exclusively for the migration crisis, but rather for all potential public health crises. The research showed that the crisis communication plan did not exist and that the manual of the World Health Organization guided the crisis headquarters in relations with the media. According to predictions Executive incorrectly estimated the entry of migrants for 1500 %. It is concluded that the executive power of the Republic of Croatia managed the migration crisis using the example of the integrated system of war medical care from the Homeland War, and the findings of the research suggest the need for communication training of public health workers.