The construction industry has growing challenges due to heightened project complexity, diverse stakeholders, and environmental unpredictability, which often compromise conventional project management methods. In response, Hybrid Project Management (HPM) methodologies that integrate predictive and agile practices have garnered recognition as an effective approach to improving project success. Nevertheless, empirical comprehension of how project complexity influences the efficacy of HPM is still constrained, especially in the context of developing countries. This study conducts a systematic evaluation of current literature to investigate the effect of project complexity on the link between HPM implementation and project success within the construction industry. This study conducts a comprehensive evaluation of current literature to investigate the effect of project complexity on the connection between HPM implementation and project success in construction industry. In accordance with the PRISMA framework, 146 peer-reviewed publications published from 2020 to 2025 were extracted from the Scopus database and examined utilizing bibliometric and thematic methodologies. The results indicate that project complexity, defined by technical, organizational, and environmental factors, substantially affects the appropriateness and performance results of hybrid approaches. HPM exhibits significant potential to enhance adaptability, stakeholder satisfaction, and performance in intricate projects; nonetheless, its efficacy depends on contextual alignment, the quality of collaboration, and managerial competence. The review emphasizes an increasing academic emphasis on complexity-driven, data-enabled, and hybrid methodologies, especially within megaproject and infrastructure domains. This study enhances theoretical understanding by integrating disparate information on complexity as a significant moderator and provides practical guidance for construction professionals to customize hybrid configurations based on project-specific complexity profiles.