PurposeUsing the lens of conservation of resources (COR) theory, the purpose of this paper is to explore the effect of humble leadership on project success by integrating the mediating role of goal clarity. The authors also argue that organizational culture moderates these direct and indirect relationships through goal clarity.Design/methodology/approachTime-lagged data were collected from 329 employees in the civil construction sector of Pakistan.FindingsThe results indicate that humble leadership enhances project success through mediating and moderating mechanisms.Research limitations/implicationsThe present research ends with an argument, managerial consequences, limits and guidance for future research.Practical implicationsThe results influence a project-based organization on the selection and promotion of humility among project managers.Originality/valueThis research answers the following research question, which has been ignored in the literature: What are the suggested mechanisms for humble leadership in promoting project success?