The subject of the final thesis is the application of business ethics in business communication. Communication is a necessary and fundamental premise of every society. Business communication is a form of communication that takes place within an organization. In other words, this communication includes its other parts and segments, so today it is one of the most important disciplines of communication science in general. Business communication deals with aspects of communication between people in the business atmosphere and the factors of enabling the effectiveness of business contacts. Ethics is an important segment in business today, both within the company and the impression that the company itself has on the environment. The public expects businesses to demonstrate a high level of ethical performance and social responsibility. Each company strives to gain the best possible public opinion. In business, account should be taken of differences in the ethical and legal standards of different societies and nations. The aim of the paper is to define basic concepts such as ethics and morals and to clarify business communication and ethics. The theoretical aspects of ethics and communication will be outlined and the practical part of the paper will highlight three companies that are considered to have implemented ethics in business and business communication.