This study comprehensively examines project execution as a mechanism of project management practice and its impact on project success in the Nigerian public sector: A case study of selected government institutions in plateau state. This study was inspired by the need to understand the impact of project planning on successful project delivery in some selected public institutions in Plateau State. The study employed a quantitative research survey design; a population of 100 staff comprising of procurement and works department of these selected tertiary institutions in plateau state with a sample size of 80 staff determined using Taro Yamane’s formula. Data were collected using structured questionnaire and were analyzed using simple linear regression to provide a comprehensive understanding of the project management dimension. The finding of the study revealed that project execution has significant effect on successful project delivery in some selected public institutions in Plateau State (?= 0.325, t= 13.738; sig. 0.000). The study recommended that there is a need for improved project execution practices through capacity building and accountability mechanisms. Public institutions should invest in training project managers and execution teams, while also establishing clear performance benchmarks and responsibility frameworks to ensure effective implementation of project activities.