The study conducts a systematic theoretical analysis of the concept of «key competencies of future specialists» in line with the ideas and provisions of modern foreign and domestic regulatory documents, scientific positions of leading scientists in the subject area, and methodological materials of practicing teachers. The purpose of the article is to identify the theoretical foundations of the interpretation of the concept of «key competencies of future specialists» in the educational and professional contexts of training in institutions of pre-university and higher education by means of generalization, comparison and synthesis of leading scientific positions. The article analyzes the interrelationships and dependencies of the concepts of «competence approach», «competence», «key competence»; the scientific approaches of domestic and foreign scientists to the systematic classification of groups of personal competencies (key – over subject, inter-subject; subject – acquired in the course of studying a particular discipline). The conclusions are drawn that competencies are a dynamic combination of knowledge, understanding, skills, abilities and abilities. The development of competencies is the goal of educational programs. Competencies are formed in different academic disciplines and assessed at different stages. Scientists argue that the competency-based approach, along with specific knowledge and skills, includes abilities, readiness to learn, readiness for professional activity, social skills, etc.; all these qualities are formed in the process of professional training. Modern employers are increasingly prioritizing the requirements for graduates of higher and higher education institutions to have systemic, intellectual, and communication skills, the ability to self-organize and organize the activities of employees, and the ability to reflect on their own activities, so society's requirements for the educational activities of vocational schools are constantly growing. The main features of the key competencies of future specialists are: multifunctionality (allowing to solve various problems of everyday professional or social life); supersubjectivity and interdisciplinarity (can be applied not only in the process of education, but also at work, in the family, in the political sphere); multidimensionality (including thought processes, intellectual skills, creative discoveries); determining the need for intellectual development of the individual (abstract thinking, critical thinking, self-reflection, recognition of one's own position).