The article is devoted to the study of stages of formation and development of deontology and professional ethics, which is relevant in terms of understanding the impact of the historical process of formation and development of deontological ideas on ethical and deontological, psychological and moral aspects of professional activity in various fields. The article presents the evolutionary path of deontology and professional ethics, from the initial understanding of the essence of ethics and

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... and ethical norms, to the development of deontology as one of the main components of various professions or activities. The main characteristics of implicit (creation of preconditions for deontology), explicit (delimitation of the concepts «ethics», «morality» and «deontology», image of deontology as a science, formation of ideas about the content of ethics) and institutional (further development) are outlined in the process of the research; the emergence of systems of professional ethical norms set in regulations and documents); stages of formation of deontology as a science; the preconditions for the emergence of deontology as a separate branch of scientific knowledge and the separation of its applied (practical) direction are determined. The essence of deontological views of Immanuel Kant, sources of Jeremy Bentham and Charlie Broad, and their influence on the formation of modern deontological systems and professional ethics are considered.