Disclosing HIV status to children before adolescence is a major challenge facing families and healthcare providers. This study used a mixed methods approach to explore the youth perspective of how youth living with HIV (YLHIV) found out their status and to quantify the association of disclosure modality with mental health, stigma, adherence, and HIV outcomes in adolescence. Youth 11-24 years of age attending adolescent HIV clinic in Moshi, Tanzania were included. Adolescents answered questions, including when and how they found out they had HIV, mental health surveys (nine-item Patient Health Questionnaire, Strengths and Difficulties Questionnaire, and modified University of California Los Angeles trauma screen), modified Berger's stigma scale, and self-reported adherence. HIV-1 RNA and latest CD4 were obtained. In-depth interviews were conducted using a convenience sample. The majority of youth reported that they found out their HIV status on their own (80%). Youth attending the government site were less likely to be purposefully told their HIV status compared with those attending the referral site (p