In the daily professional activity of a psychologist, the issue of his authority is of particular importance. In the first part of the article, the very concept of authority is the subject of scientific reflection. Authority in the proper sense means a person who, thanks to a set of personality traits, in particular competences in a given area, determines the shaping of judgments, opinions and attitudes of another person or social group, recognizing its value. The second part deals with the issue of the authoritarian personality. Authoritarianism describes the actions of the authorities using all means to implement their own, sometimes dogmatically understood political concept and forcing others to behave desired by it. This concept falsified the classical sense of authority. The third part of this article concerns the profession of psychologist in the dimension of authority. A psychologist should take care of his professional and moral authority for the benefit of his patients and clients, observing the basic ethics of the psychologist's profession.