Abstract: Unmet demands and expectations and poor service delivery in public entities, has pushed people to demand for reforms for improvement of service delivery by the Kenya police service. Thus, the study sought to assess the effect of professional conduct reforms on service delivery by the Kenya police service in Homa Bay County, Kenya. The study was anchored on core competence theory and adopted the cross-sectional research design. The target population was the 29 police stations in Homa Bay County and 77 police officers from different ranks. Both qualitative and quantitative data was collected and analyzed through descriptive, correlation, regression and content analysis. Findings from descriptive analysis showed high scores for professional conduct reforms (M=3.84) and service delivery (M=4.065) an indication that respondents agreed to the association between the two variables.