Project complexity is defined by dimensions such as structural complexity, uncertainty, pace, dynamic complexity, novelty, social-political and institutional complexities. In this article, these dimensions were discussed and organized to form a comprehensive framework. The major contributions of this article were the introduction of institutional complexity and the development of a project complexity framework to allow researchers and practitioners to better understand projects and make more informed decisions. Similarly, industries may benefit from these findings and the framework, applying it in their projects, grasping complexity from them.