Background: Several reproductive health challenges confront adolescents (10-19 years) globallyrnand are more pervasive in developing countries where services and facilities are absent. Anrnestimated 1.3 million adolescent girls and 780,000 adolescent boys are living with HIVrnworldwide, and 79 percent of new HIV infections among adolescents are in Sub-Saharan Africa.rnWith 104 births per 1,000 women aged 15-19, Ethiopiaâ€™s high adolescent birth rate was likelyrnassociated with the low use of modern contraceptives. Regardless of the interventions put inrnplace for adolescents as a response for reproductive health needs of adolescents in Ethiopiarnadolescent and youths are still facing reproductive health challenges; furthermore knowledge andrnutilization of the youth friendly reproductive health service in available places has not beenrnassessed in an all inclusive manner.rnObjectives: To assess knowledge and utilization of youth friendly reproductive health servicernamong adolescents in Addis Ababa.rnMethod: A community based cross-sectional study was conducted in a randomly selected 5 subrncities in Addis Ababa. Data was collected from 755 adolescents aged 15-19 through structuredrnquestioner. Data was coded cleaned and entered using EPI data 3.1 and transported to STATArn12.1 for analysis. Descriptive analysis of respondents was done. A bivariate analysis was donernidentify factors associated with utilization of youth friendly reproductive health service andrnreproductive health knowledge those with a P