Purpose: The purpose of this article is to present the relationship between the level of a manager's maturity and their effectiveness in performing their role. Design/methodology/approach: This article is an overview that presents a new perspective in the perception and assessment of managers' effectiveness, namely managers' personality maturity. Findings: The conducted considerations show that the maturity of a manager's personality determines the maturity level of their personal behaviour,

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... ch creates space for effective managerial activities. Research limitations/implications: It is recommended to continue empirical investigations using strong diagnostic tools, including personality diagnostics in a large research group of managers. Practical implications: The relationship presented in this article between the level of managers' maturity and their ability to perform effective managerial behaviours at the organizational level creates a research area for determining the relationship between personality predispositions and their usefulness in the effective achievement of the tasks entrusted to managers. As a result, it is possible to shape the desired self-development conditions that are conducive to building and strengthening a mature personality. Social implications: If introduced as a permanent category in assessing managers' effectiveness, personality maturity, understood as the ability to assume responsibility for one's personal self-development, can significantly incentivise organizations to create space for managers' psychological responsibility for the development of themselves and their employees. Originality/value: A close relationship has been identified between personality traits and their development and managers' efficiency and effectiveness in achieving assumed goals. It is shown that a manager's mature personality increases their chances of fulfilling expectations regarding the ever-increasing and more complex demands of their role.