The contribution of project teamwork is based on the project members toward project success has remained unattended in prior literature. This paper highlights the importance of project teamwork for the project success and argues that leader alone cannot successfully complete a project. This study is based upon Higher Education Commission (HEC)'s projects in Pakistan and data has been collected from project leaders regarding performance and contribution of project team work toward project success. It is hypothesized that there is a positive and direct relationship between the project teamwork and project success. For the purpose of verification of this relationship with the project managers were requested through e-mail to complete questionnaires. Further, this relationship is verified theoretically and empirically by applying Partial Least Square-Structural Equation Modeling (PLS-SEM). It is concluded on the basis of results that project teamwork has a positive and direct relationship with project success. The findings of the study may be helpful for policymakers and project team leaders to understand the importance and contribution of project teamwork toward achieving project success, especially in developing countries.