Abstract: The paper analyzes the existing theoretical knowledge on modelling business processes of an enterprise in the conditions of the development of digital technologies. The purpose of the article is to generalize the existing views on the definition of the term «business process» and to note certain common essential features inherent in business processes, which consist in the awareness of the purpose of their implementation, repeatability (cyclicity), formation in time-space, provision of a certain resource, effectiveness. In view of the consolidated classification of enterprise business processes developed by scientists, with which the author agrees and the reference to which is indicated in the article, the developed standards for their description were considered. Thanks to the rapid development of digital technologies, new possibilities and ways of processing, presenting, saving and using information are opening up. Due to the tools developed on their basis, it was possible to analyze the approaches and ways of building graphic models of business processes, created according to the methodology of structural analysis (SADT) with the use of modern digital tools such as the graphical modelling language BPMN. We came to the conclusion that by having an idea of the functional structure of an enterprise, the purpose of its activity, and the list and content of existing business process models, using modern digital business process modelling tools, it is possible to significantly optimize work and obtain better results of operational activity. The application of the specified toolkit provides an opportunity to determine the degree of development of the business process, the ability to make quick adjustments by making changes, eliminating deficiencies, and checking the effectiveness of the system at the modelling stage. This will ensure a higher level of competitiveness for an enterprise in modern digital conditions.