Trichomonas vaginalis amongst other STIs facilitate the natural history of HIV infection and may play an important role in the transmission dynamics of HIV. In this study we determined the prevalence of T. vaginalis infection and associated risk factors among HIV-1 infected women attending antiretroviral treatment Center at Jos University of Teaching Hospital. The study was a cross sectional survey of 168 HIV-1 infected women who presented to the STI clinic with symptoms and/or without symptoms of T. vaginalis infection from November 2015 to January 2016 after obtained informed consent. Demographic data and high vaginal swabs were collected by trained nurse. The samples were examined by light Microscope to identify T. vaginalis, Candida species and bacterial vaginosis. Of 168 HIV-1 infected women, 87 (51.8%) were positive for T. vaginalis infection. The rate of co-infection of T. vaginalis with bacterial vaginosis, Candidiasis was 44.8% and 5.7% respectively, both showed no statistical significance, P=0.360. The highest prevalence of T. vaginalis infection 29.8% was among individuals in the 30-41 years age group while the lowest 3.05% was among individuals in the 54-65 years age group. In the univariate analyses; age, occupation, educational status, marital status, previous history of STI, condom use, multiple sexual partners, pregnancy, ART status and symptoms manifestations showed no significant association, but in multivariate analyses, history of STI , symptoms manifestations showed significant association with p>0.05. The high prevalence of T. vaginalis highlights the need for routine screening among HIV-infected women.