The purpose of this study was to find out how school administrators implement ICT in human resource administration in public secondary schools in Kajiado County, Kenya. Descriptive survey design was therefore suitable for this study. The design was useful in describing the characteristics of a large population and made used large samples in making the results statistically significant. The target population for this study was the 61 public secondary schools’ principals, 1220 teachers, 610 students, 25 ICT teachers, 6 Sub-county Directors of Education in the 6 Sub-counties and 1 County Director of Education in Kajiado County. The study used 30% of the accessible population as sample size. The sample size for this study was therefore 18 principals, 366 teachers, 8 ICT teachers,183 students, 2 Sub- county Directors of Education and 1 County Director of Education. This study used questionnaires, Observation schedules and interview schedule as tools for data collection. The overall implication of the findings in this study was that use and implementation of ICT in all the departments of school administration of the public schools in Kajiado County was very low. The study concluded that most of the public secondary schools in Kajiado County had not embraced ICT in various areas of administration. Based on the findings, the study recommends that proper technology should be put in place by purchasing of the required ICT facilities in schools to enhance management of schools using the current technology.