The topic of this thesis is Analysis of Communication Styles in Business Negotiation. The importance of communication in everyday interaction is an indisputable fact, and mastering different styles of communication is a necessary skill in many spheres of life, and especially in the processes of different types of negotiations. This thesis will analyze and clarify different communication styles and their contribution to business negotiations. After an introductory overview of the concept of communication in a general sense and its division into two types (verbal and non-verbal), the thesis will distinguish and analyze four communication styles: passive, aggressive, passive-aggressive and assertive. A special focus will be on the analysis of the advantages and disadvantages of each of the mentioned styles in business negotiation. The thesis aims to show why it is important to understand different communication styles and their application in different types of negotiation. Adequate use and understanding of communication styles can affect success or failure in reaching consensus during business negotiations. In addition to the literature analysis, the thesis will deal with the analysis of the results of the conducted survey, which aims to show which are the most commonly used communication styles in everyday business negotiations, whether the styles can be changed according to needs, and how much individuals are aware of which style they use, i.e. whether they are aware that the ultimate the outcome of the negotiation is closely related to the communication style.