The purpose of this study was to assess the influence of organizational roles on administrative performance in public secondary schools in Nakuru County, Kenya. The study adopted a mixed-method research design. The study targeted 352 principals in public secondary schools and 11 Sub-County Quality Assurance and Standards Officers in Nakuru County. Using stratified random sampling, a sample size of 106 principals and 4 Sub-County Quality Assurance and Standards Officers (30 % of the population) was selected. Data collection methods included questionnaires administered to principals and interviews conducted with Sub-County Quality Assurance and Standards Officers (SCQASO). Quantitative data were analyzed using descriptive and inferential statistics, including Pearson’s correlation and regression analysis, while qualitative data underwent thematic analysis. A pre-test involving 11 schools in Nyandarua County confirmed the reliability of the research instruments, yielding a Cronbach’s alpha of 0.805. The study found that the correlation coefficients between organizational roles and administrative performance in public secondary schools in Nakuru County, Kenya (r = 0.567, p = 0.002) was strong and significant. Organizational role significantly influenced the administrative performance of principals, ultimately enhancing school effectiveness. To improve public secondary school administration, it is recommended that clearly defined administrative roles be established.