Over the years leaders have been faced with a set of challenges in a bid to meet customer expectations in service delivery, Kenya has experienced a fundamental change over the years in delivering public service, with the latest being the establishment of Constitutional Commissions to enhance efficiency and effectiveness in service delivery. This study sought to analyze the leadership capabilities and its influence on the delivery of the Constitutional mandate. The specific objective of the study was to examine the influence of strategic leadership capabilities on delivery of constitutional mandate. The study was guided by the Resource Base Theory, and Dynamic Capacity Theory. The study utilized a mixed-method research design targeting three Constitutional Commissions under Article 59 of the Constitution of Kenya. The study employed a stratified sampling technique, comprising of purposive and simple random sampling. A sample size of 177 respondents was drawn from the target population of 330 from the three constitutional commissions. This study used a questionnaire as the research instruments. Descriptive statistical tools and inferential statistics were used for data analysis. The results showed that the strategic leadership capabilities (p<0.05; ß=0.489), had a positive performance in the delivery of constitutional mandate by the constitutional commissions. The correlation findings also showed a positive and statistically significant correlation between strategic leadership capabilities and Performance (r=0.543, p<0.01). The study recommends that the constitutional commission, pays close attention to strategic leadership capabilities and adapt their structures to the requirements of the constitution of Kenya.