The purpose of the study was to determine the effect of participative management on performance of public organizations case of Murang’a County Government. The study sought to examine the effect of employee participation, ethical practices and core competency on performance of public organizations case of Murang’a County Government. Core competency was measured using required knowledge, professionalism, self-development and team work. While time management, integrity, dedication and accountability were used to establish ethical practices. Whereas employee participation was established by staff involvement, financial decision making, access to information and personnel decision making. The study employed mixed research design. The quantitative data was collected with the use of questionnaires and was analysed using STATA 14 statistical package. Qualitative data was collected using interview guide and thematic analysis was used in data analysis. The study targeted Murang’a county employees and the sample size was 353 respondents. The study used descriptive statistics for descriptive analysis and presented the result using graphs, tables, figures and charts to enhance clarity and impact. The findings of the study were further presented using figures, tables and graphs. Regression analysis was used to determine the relationships among the variables. The study found out that core competency has a significant positive effect on organizational performance. The study therefore concluded that organizational performance is significantly affected by core competency. The study further concluded that ethical practices has a significant positive effect on the performance of Murang’a County Government. In addition, the study concluded that employee participation has a significant positive effect on the performance of Murang’a County. According to the study, professionals should manage county matters rather than politicians. To establish the kind of professionals required to serve in leadership roles at the county level, policies should be put in place. From a policy perspective, the study also suggests that the national government implement a change management procedure that will ensure that county government employees are well-trained on the dynamism that comes with devolution as well as on human resource development programs that will ensure in the future that there is knowledge retention within devolved units for better service delivery. Further, the study recommends internal audit in departments to prepare continuous reports on employee involvement, and that employees participation forums should be conducted during weekends.