The main objective of this study was to examine the impact of information technologies on the management of hotel companies with 4 and 5 stars in Split-Dalmatia County. Because of frequent changes faced by hotel companies, intense competition and demand of the customers, information technologies have strategic significance and the current state and future of the hotel business depends on their application. Hotel companies increasingly apply information technologies to better and more easily share information and resources, among its own departments and between themselves and partners, to easier select the employees who need specific training, to maintain and improve connectivity with clients and to attract new clients and made work more comfortable, more efficientand and more successful. First part of thesis presented the subject and the research problem, also hypotheses, objectives, contribution and methods that were used in the preparation of this study. The theoretical part of thesis covered features of the tourism markets, the levels of hotel management, defined the information technologies and their impact on tourism, explained the potential of using Web 2.0 tools in the management of the hotel companies, explained the concepts of e-commerce and e-business and the implementation of information technologies in the hotel business. The last part of thesis conducted a statistical analysis of data obtained by analysis of survey questionnaires which were carried out over the hotels with 4 and 5 stars in Split-Dalmatia County. In accordance with the results of the research all hypotheses were accepted, which means that information technologies positively affect management of the hotel companies with 4 and 5 stars in the area of Split-Dalmatia County.