Purpose of the Study: This study examined the influence of Cloud Security Management on service delivery in Nairobi City County e-services. Guided by Information Security Theory, the research sought to determine how cloud security practices, particularly confidentiality, integrity, and availability, affect the efficiency, reliability, accessibility, and trustworthiness of public digital services. Methodology: The study adopted a mixed-methods design combining descriptive and exploratory approaches. A sample of 177 employees was selected from a target population of 316 using Slovin's formula and stratified random sampling. Data were collected through questionnaires and interviews and analyzed using descriptive statistics, correlation, regression, and thematic analysis. Findings: The study achieved a 91% response rate, with 161 respondents participating. Results indicated that Cloud Security Management positively influenced service delivery, recording an overall mean score of 3.73 (SD = 0.90). Citizen trust (Mean = 4.21) and data protection (Mean = 4.15) emerged as the strongest indicators of effective service delivery. Regression analysis established a statistically significant positive relationship between Cloud Security Management and service delivery performance (β = 0.156, t = 2.294, p = 0.023). The findings suggest that stronger cloud security measures enhance operational efficiency, service reliability, data protection, and public confidence in county e-services. Conclusion: The study concludes that effective Cloud Security Management significantly improves service delivery in Nairobi City County e-services. Strengthening security controls enhances reliability, efficiency, and citizen trust. The study recommends continuous staff training, stronger inter-departmental security coordination, and the adoption of user-friendly security mechanisms that balance accessibility with protection.