Objective: The aim of this study was to find the characteristics of bacterial vaginosis (BV) among HIV-infected and HIVnegative pregnant women at ABUTH, Zaria.Study design: Case control and laboratory-based design, conducted from August 2, 2011, to December 30, 2011. BV was defined using Amsel's criteria, which uses 3 out of 4 diagnostic criteria to diagnose BV.Results: Two hundred HIV-positive and 200-HIV negative women were included in the study. The mean age was 26.3 years with a range from 17 to 41 years. The prevalence rate of BV irrespective of HIV status was 33.2%. In HIV-positive pregnant women, the prevalence was 46.0%; in HIV-negative pregnant women, the prevalence was 20.5% (OR=3.30; 95% CI: 2.1-5.1, P<0.05). Hence, HIV-positive pregnant women were significantly more likely to have BV. BV was most prevalent in the age group of 30 to 34 years, with 49% positive, and in those with parity between 1 and 4, with a prevalence of 41.5%. It is least common in primigravidae with 19%. Prevalence among HIV-positive pregnant women whose CD4 > 350cells/mm 3 was 22%, and for those whose CD4 was < 350 cells/mm 3 prevalence was 67% (OR=7.05; 95% CI: 3.7-13.3, P<0.05). Conclusion: BV is more prevalent among HIV-positive pregnant women than their HIV-negative counterparts, and its occurrence is higher among those with the lower CD4 count; therefore, reducing the prevalence of HIV among pregnant women and improving the CD4 count among HIV-positive pregnant women would reduce the prevalence of BV and its consequences.