Background: HIV infection among pregnant women poses particular risks to their family,rnoffspring and health workers at the time of delivery. Potential mother to child transmission ofrnHIV (vertical transmission) is a major concern, because of the attendant consequences ofrnmorbidity and mortality of these infections.rnThe epidemic varies with geographic region based on 2002 data; Sub-Saharan Africa had thernhighest number of HIV infections. Besides what has been saying and done, this study couldrnprovide relevant and update information concerning the epidemic among pregnant women so asrnto take effective interventions towards the problem by the concerned bodies.rnObjective: To assess prevalence of HIV among pregnant women and its associated factors inrnAddis Ababa and suggest possible intervention measures.rnMethods: A retrospective study was conducted from September 2010 to February 2011 atrnKazanchis Health center, Addis Ababa, Ethiopia. During the study, the test results of allrnantenatal care attendants in the period between 2006 and 2010 were taken from ANC PMTCTrncounseling register. Thereby 3568 pregnant women were collected as source population andrnconsequently analyzed accordingly.rnResult: A total of 3568 ANC attendants were enrolled in the period between 2006 and 2010 andrntheir data was collected and analyzed. Data was presented by age group. The annual prevalencernrates were found to be 11.15%, 7.88%, 8.66%, 6.70%, and 5.69% in 2006, 2007, 2008, 2009, andrn2010 respectively. The highest rates of prevalence were observed in the age categories of 20 torn29.rnConclusion: Prevalence of HIV among ANC attendants in the last five years is in a decliningrntrend. In the health center, the overall prevalence rate decreased from 11.15% to 5.69% withinrnthe past five years. The pattern of HIV prevalence among pregnant women who visited the ANCrnindicates that high prevalence rates were observed in the age categories of 20 to 29 followed byrn30 to 39. Whereas percentage of HIV positive pregnant women both taking ARV prophylaxisrnand who have been counseled on infant feeding more or less has been increasing.rnxirnKey words: HIV infection, ANC attendants, Prevalence, age categories, pregnancy, KazanchisrnHealth Center, ARV, Counseling