Abstract: The purpose of the study was to establish the Determinants of Inventory Management on Service Delivery in Trans Nzoia County Level Four Hospital, Kenya. The analysis was focused on the respondents of the target population of the study. The specific objectives of the study were: Lead Time, Staff Competence, Records Management Practices and ICT Practices on Service Delivery in Trans Nzoia County Level Four Hospital. The study was anchored on the following theories; The EOQ theory, Transaction Cost Theory, Resource Based View Theory (RBV) and The Theory of Change. A descriptive research design was adopted. The target population was 200 respondents who comprised of employees from the following departments in Tran Nzoia Level four hospital; procurement, finance, pharmacist and administration department resource respectively. The researcher did a census survey.