Background: Hepatitis B virus (HBV) and hepatitis C virus (HCV) are among the most chronic viral infections worldwide.Co-infections with HBV and HCV have become increasingly common among people living with HIV, resulting in a growing public health concern. The primary aim of our study was to determine the prevalence of HBV and HCV and their associated factors among HIV-1-infected patients attending the Ngong Sub-County Hospital comprehensive care clinic.Methods: After providing consent, a 5 mL blood sample was collected from each study participant visiting the comprehensive care clinic. The blood was screened for hepatitis B surface antigen and HCV antibodies using chemiluminescence immunoassay test according to the manufacturer's instructions. The CD4 T-cell counts were determined using FACSCalibre machine, while HIV-1 viral load was determined using the Abbott m2000rt System according to the manufacturer's instructions. A questionnaire was used to collect sociodemographic information and data on factors associated with HBV and HCV co-infections.Results: One hundred and ninety HIV-1-infected patients participated in this study: 150 (78.9%) women and 40 (21.1%) men.In the overall study population, the prevalence of HBV co-infection was 5.8% (95% CI, 2.6%-8.9%) and of HCV coinfection was 4.2% (95% CI, 1.6%-7.4%). However, no individual was co-infected with all 3 viruses. HCV was associated with antiretroviral treatment (OR 0.2; 95% CI, 0.0-0.8; P=.036), while HBV showed a significant association with condom usage (OR 0.3; 95% CI, 0.1-0.9; P=.039) and median viral load.