In today's dynamic business environment, one of the crucial topics in bussines management is matter of organizational culture as well as establishing healthy and strong organizational culture which can contribute to more successful business. Furthermore, an important factor of successful business are also corporate communications, which aren't only related to communication with external public, but also is important in communication with employees. Employees need to become a brend ambasadors, and each company must ensure that employees understand its goals and processes in order to positively reflect on business. That is precisely why the main goal of this paper was theoretical elaboration of the main concepts related to understanding of this topic. Also, according to the processed literature and the theoretical elaboration of the topic of this paper, the aim of this paper was to show physical manifestations of organizational cultures and its corporate communication of three companies – Lush, Bio&Bio and Uber analyzed by case studies. This resulted in giving the answer to the main research question of this paper – What is the role of organizational culture in corporate communications of companies Lush, Bio&Bio and Uber. By document analysis, analysis of official websites and media articles of each company and by short, focused interviews with one employee of each company we came to the conclusion that te main role of organizational culture is creation of positive and recognisable identity of the company, and indirectly, recognisable image and positive reputation of the company in public and among its stakeholders which can be reflected on successful business and creation of competitive advantage on the market. Because of this fact, and especially because of today's modern business models in which companies are taking care more of people than of strict procedures and patterns, and because of the multitude of information that are people surrounded by today, it is necessary to establish healthy and strong organizational culture as a fundation of successful business of every company.