The topic of the thesis is "The role of integrated marketing communication in internal marketing." Through the paper, the concepts of communication, its determinants, forms and functions, elements of marketing communications, the effects of communication itself, and integrated marketing communication were discussed. Furthermore, the paper has dealt with internal marketing throughout its history, the concept of internal marketing, and its management and applied in practice. As an example of internal marketing in practice, one of the leading food companies in the region was taken, and that is Atlantic Grupa. As information and communication technology evolves, so does the daily lives of people, both business and private. Integrated marketing communication tries to reach as many consumers as possible through various forms of advertising and promotion. In this way, information becomes easily accessible to consumers, communication is faster and better, and it is easier to get in touch with consumers themselves. Employees are a growing factor in every corporation as they are increasingly in constant contact with consumers. They represent human resources in corporations, and they play an important role in providing the highest quality service to consumers. This is where internal marketing comes into play. Internal marketing tries to build the culture and corporate brand of the corporation itself, and is based on communicating with employees. It is important to encourage and motivate employees in order to encourage them to do their jobs better and with better quality, and to achieve the best possible communication with consumers. The focus of internal marketing is based on retaining the best customer-oriented employees. Managers have a job to provide and provide employees with everything they need for their work, and to make that work as high quality as possible. The aim of this paper is to find out to what extent the employed population of the Republic of Croatia is familiar with internal marketing in companies, and whether integrated marketing communication and its use in practice leads to an increase in product sales.