Adolescent Sexual Reproductive health is a state of complete physical, mental and social well-being, and not merely the absence of disease or infirmity, in all matters relating to the reproductive system of people between the ages of 10 and 19. However, the alarming statistics on increase in early pregnancy among the adolescents leading to risks associated with early pregnancy and Sexually Transmitted Infections, could be an indication that the Adolescent Sexual Reproductive Health Services are not being utilized despite the intervention of the Adolescent Reproductive Health Service policy which was reviewed in 2015. In Bondo Sub- County which is in Siaya County, evidence suggests that teenage pregnancy has increased from 17% in 2014 to 35% in 2016. The objective of this study was to investigate the factors contributing to utilization of the adolescent’s reproductive health services. The specific objectives were; to describe the utilization of the Adolescent Sexual Reproductive Health Services by the demographic characteristics of the adolescents, to establish the relationship of utilization of the Adolescent Sexual Reproductive Health Services levels by household characteristics, and to determine the association of knowledge and utilization of the Adolescent Reproductive Health Services The study was vetted and approved by the Great Lakes University of Kisumu and Jaramogi Oginga Odinga Teaching and Referral Hospital ethical review committees, and National Council for Science, Technology and Innovation This study employed a descriptive cross sectional study design; and, a multistage cluster sampling method was used to select the respondents. Sample of 392 students were interviewed. The response rate was 98%. The study used structured questionnaires which were administered using research assistants through interview. SPSS was used to enter data, and STATA used to analyze the quantitative data. Descriptive analysis was used to determine the utilization of ASRHS by demographic and household characteristics. Cross tabulation was done followed by chi square statistics to get the independent variables that were significantly associated with utilization of Adolescent Reproductive Health Services. Results with p< 0.05 were considered statistically significant. Odds ratio and 95% confidence interval was used to determine the strength of association between knowledge and utilization of Adolescent Sexual Reproductive Health Services. The findings revealed that adolescents within the lower classes in secondary schools rarely utilize the ASRHS as compared to the adolescents in form four. Gender of the adolescents was not associated with use of the reproductive health services. Secondly, various household characteristics such as school clubs, Positive family discussion on ASRHS, religious status of guardian, and living in rural area influenced utilization of the Adolescent Sexual Reproductive Health Services. Thirdly, knowledge on the Adolescent Sexual Reproductive Health Service was not associated with utilization since majority of the adolescents had information of the actual services offered; however, few of the adolescents had used the services. Overall, this research revealed a gap in utilization of Adolescent Sexual Reproductive Health Services among the adolescents, which were related to age, household characteristics, and inconsistence of knowledge to utilization. This study therefore recommended that all schools should come up with a program or clubs that can empower adolescents with knowledge on Adolescent Sexual Reproductive Health Services, and school peer educators should be trained to complement the teacher counselors. Further research should be carried out to evaluate the success and gaps in the Adolescent Sexual Reproductive Health Policy, the school curriculums and the Youth Friendly Reproductive Health Services.