The main purpose of this thesis is to demonstrate the importance of communication in crisis situations. The paper deals with the theoretical aspects of the notion of disaster, the type of disaster, the basic disaster group, the general model of disaster adaptation and the effects of disasters. The concept of communication, crisis communication strategy and the role of communication in times of disaster was also addressed. The basic features of communication during the time of disaster, disaster communication and information sources during disasters have been elaborated. Empirical research was conducted by quantitative analysis of articles and the publications of Internet portals and responsible bodies on the topic of flooding in Slavonia and the fire in Split and its surroundings, and through a survey questionnaire among respondents in the Republic of Croatia. The survey questionnaire was used to examine attitudes and opinions about media activity in crisis situations. By analyzing the results, we conclude that mass media represent an important source of information for all participants in the crisis situation, that the public prefers news from social networks and internet portals, and that social networks are not an excellent way to respond in the event of a disaster. By quantitative analysis of articles and the publication of Internet portals and responsible bodies, it was concluded that in the case of flooding in Slavonia and the fires in Dalmatia the population could get more information via the Internet portals.