County governments were created for the purpose of efficiently delivering services to citizens. However, the delivery of services in county governments in Kenya seems to face several challenges not providing the citizens efficient services as expected. This shows that in as much as the national government devolved financial resources, there is scanty and apparent realization of the objectives that were envisioned in county governments. The purpose of the study was to examine the influence of devolved leadership structures on service delivery in county governments in Kenya. The aim of leadership and governance structures are therefore, to enable government activities, primarily service delivery, through synergy, efficiency and effectiveness in delivering services to sustain democracy and strengthen delivery capacity across all spheres of government for the common good. The study pursued the following specific objectives; To establish the influence of leadership structure and leadership decision process on service delivery in county governments in Kenya. The study was anchored to Contingency Leadership Theory and Path goal theory. A conceptual framework was developed to show the relationship between the independent variables (leadership structures and leadership decision process) and dependent variable (service delivery in county governments of Kenya). The target population of the study was 2,061 county government officials from all the 47 counties in Kenya who included; the governors, deputy governors, county secretaries, ward administrators and county executive members. The study sample was 384 respondents. The study used regression analysis and moderated stepwise multiple regressions to analyze the association between leadership and governance structures moderated by legal & regulatory framework on service delivery in county government variable at 0.5 level of significance. Results revealed that all the devolved leadership structures had a positive and significant relationship with service delivery of county governments in Kenya. The study concluded that devolved leadership structures had the potential of positively influencing service delivery in terms of timely and quality delivery, improved infrastructure and citizen service satisfaction. The results support the current theories related to the study. Consequently, this study provides national and county governments with insights of how to improve service delivery through the implementation of devolved leadership structures. The study recommends that national and county governments should adopt a culture of enhancing devolved leadership structures (leadership structure and leadership decision process). This could go a long way in ensuring there is improved service delivery in the county governments in Kenya.