OBJECTIVES: To understand the levels and determinants the HIV Transition Clinic services utilization by young adults at Infectious Diseases Institute, Kampala, Uganda. METHODS: A cross sectional study using quantitative methods at a HTC in a sample of 379 young adults living with HIV/AIDS (YALHA) between the ages of 15-24 years. At analysis utilization was categorized into two levels; regular (kept all appointment visits) and irregular (missed one or more appointments visits) utilization. Univariable, bivariable and multivariable logistic regression was used to establish determinants associated with utilization of the HTC. RESULTS: Of the 379 total respondents, only 32.4% were regular utilizers of the HTC. There are low levels of regular utilization of the HTC. Female young adults have better service utilization rates compared to the males in HTC. The male to female ratio was 1:5.  The determinants of HTC regular utilization were CD4 cell count category of 250-2603/µl (AOR 0.58, 95%CI: 0.36-0.95), not currently on ART (AOR 0.27, 95%CI: 0.15-0.47) and did not receive counseling services (AOR 0.47, 95%CI: 0.27-0.83). CONCLUSIONS: The factors that were associated with reduced the chance of regular use of the HTC were: CD4 cell count between 250-2603/µl;  not being on ART; and not receiving HIV counseling services.  The young adults in the HIV transition clinic should be screened on a regular basis to detect those with a CD4 cell count of <350/µl and counseled for early initiation of ART so as to enhance regular HIV transition clinic utilization. In addition a reminder system like peers, family and mobile phone messages should be set up for young adults so that they are reminded of their appointments hence facilitating regular use of the transition clinic.