Nutrition is an important component of comprehensive care for people living with HIV speciallyrnadolescents, since it is a period of rapid growth and maturation in human development thatrndemands extra nutrients and energy to support growth. Focusing on adolescentsâ€™ nutrition,rnprovides a unique opportunity to break the intergenerational cycles of malnutrition. This studyrnwas aimed to assess determinants of nutritional status among Adolescents (10-19 years) livingrnwith HIV/AIDS and attending Anti- Retroviral Therapy (ART) clinic at Zewditu Memorial hospitalrn(ZMH), Addis Ababa. Institutional based Cross-sectional survey design was employed amongrnrandomly selected 226 adolescents (10-19 years) attending the ART clinic. Structuredrnquestionnaire was used to gather necessary information from the respondents and Key informantrninterviews was also held for the purpose of the study. Whereas, anthropometric measurement wasrnused to collect height and weight following the standard measurement tools and procedures. Datarnwas entered into SPSS version 22 and anthropometric measurements were converted into Z-scorernby WHO Anthroplus version 1.0.4 software. Then exported to STATA 14 and was analyzed usingrndescriptive and inferential statistics. Ordered logit model was employed to analyze factorsrndetermining nutritional status of adolescents living with HIV/AIDS while descriptive statistics wasrnemployed using T-test and chi-square. Nutritional status was assessed using Height-for-age (HAZ)rnand BMI-for-Age (BAZ) as measures of stunting and thinness respectively. The result revealed thatrnthe prevalence of stunting was (37.5%) and thinness (49.8%). The result of ologit model indicatedrnthat, sex of adolescent, age of adolescent, no of children in the family, mother level of education,rnplace of residence, initial CD4 count, ART duration in moths, previous weight and previous heightrnwere found positive and negative significant determinants for adolescent stunting at 1%, 5% andrn10% level of significance. While, age of adolescent, parental status, mother employment status,rnaverage monthly income of the family, recent viral load, feeding support and nutrition counselingrnwere found to be positive and negative significant determining factors for adolescent thinness atrnp< 0.01, p