Internal communication is communication within an organization itself, and refers to communication between senior and junior managers, between management and employees, as well as between employees themselves at all levels. Internal communication is essential to avoid uncertainty, rumors and lack of motivation among employees, and has become one of the major factors behind a company's comparative advantage. The company can successfully communicate with the environment only if there is good communication and coordination within the company. Through this work, the author conducted a research of satisfaction with internal communication on a sample of employees of the interior ministry. The research was survey, conducted in December 2019, and compiled the answers to the sample of 100 respondents, employees of the first police station Zagreb. With good internal communication, employees gain a sense of belonging to the company, which is very important because it reduces the departure of workers from the company. In order to build a modern police force, based on cooperation and transparency, it is necessary to introduce changes in work area of public relations, primarily responsible for the quality of communication with internal and external public, and with that for good image of the police and the ministry.