Quality management is one of the areas of knowledge in project management and implies two components - the quality of the product and the project management processes quality. In modern literature, considerable attention is paid to the first component - the quality of the product. It is explained by the fact that this direction is connected both ideologically and methodically with quality management system (QMS), international quality standards, which is well represented in various modern research. The project management processes quality is a property of the management system and reflects its ability to successfully control and implement a project. Since the success of a project is the achievement of the project's goals and intended results in a timely manner within the established budget constraints, the management processes quality is associated precisely with ensuring the project success. This understanding of the management processes quality is considered as the basis in this study. Naturally, the presence and degree of such a property as the management processes quality should be assessed both at the beginning and throughout the entire project life cycle. This allows, on the one hand, to assess and monitor the project success; on the other hand, to identify problems in order to take adequate corrective actions. In this study, entropy is considered as an integral indicator for the project management processes quality, characterizing the project "manageability" and "confidence" in certain project results. This is a new approach essence to the information entropy use, which does not contradict existing theories and approaches, but complements and develops them. In this research, taking into account the entropic concept, it is proposed to use the information entropy as an indicator of project management processes quality, which is considered as the management system ability to minimize, through preventive or adaptive measures, uncertainty or negative external and internal impact on the project to ensure the project success.