This study examines the impact of Industry 4.0 on the concept of leadership approaches. The research aims to compare leadership theories before and after Industry 4.0, determine how leadership roles have evolved in agile project management, and identify effective leadership styles. The study employs literature review and qualitative research methods, specifically using focus group studies. Two separate focus group studies were conducted through online meetings and face-to-face sessions to thoroughly examine the approaches of executives from companies who have mature project management offices in Turkey. Data were obtained by transcribing the audio recordings of discussions during focus group sessions and comparing them with researcher notes. The study extensively examines the impacts of identified leadership styles, determined through literature review, on the management of agile project teams. Findings indicate that leadership styles such as visionary, organizing, relational, and social leadership play significant roles in agile project management. Additionally, leadership personality traits observed in each of these styles have been identified. The results underscore the need to redefine leadership approaches and highlight the effects of Industry 4.0 on project management. By linking the characteristics of leadership styles and their impacts on agile teams with the literature, the study contributes to future leadership research and practices. In this context, it emphasizes the development of technological competencies for organizations to succeed and the need for flexible and innovative organizational structures. Furthermore, it suggests that leaders in the digital transformation processes brought by Industry 4.0 should possess skills to facilitate their employees' adaptation processes. This study contributes significantly to academic literature and business by exploring leadership evolution in Industry 4.0 and redefining roles in agile project management, emphasizing ongoing focus on development and innovation in leadership.