A computer network is a set of two or more computers that are connected and through their work share some kind of data or programs. Such a system provides the possibility of fast data exchange between computers. The mentioned system is not ideal and is threatened by certain security threats such as malicious software, some of which are viruses, worms, trojans, adware or spyware. Considering the growing importance of the tourism sector both in Croatia and in the global economy and the technological innovations that are applied in the tourism sector, it is necessary to focus attention on the importance of researching certain negative factors that occur. In addition to various security problems that occur in the tourism sector, such as thefts, traffic accidents, the spread of diseases, and similar, the goal of this paper was to analyze computer security in tourism through the presentation of basic definitions of computer security, and solutions that can and are applied in the tourism sector.