In sub-Saharan Africa (SSA), a systematic approach to exploring the prevalence of psychiatric disorders (PDs) and adherence to antiretroviral treatment (ART) in adolescents living with HIV (ALWHIV) is lacking. This study aimed to systematically review the studies conducted in SSA on the prevalence of PDs among ALWHIV and their association with ART adherence. A systematic search of all English studies assessing PDs among ALWHIV using the Web of Science, PubMed, and EBSCO databases was conducted between March 1 and September 30, 2019. Forty-two studies published between 2009 to 2019 met the inclusion criteria, of which 15 were included in the meta-analysis. The most common PDs were depression (0.24, 95% CI 0.14–0.36) and anxiety disorder (0.26, 95% CI 2–0.44). The available evidence could not conclude on the definitive association between PDs and ART adherence; therefore, further research is required. However, the need for mental health integration in the care for ALWHIV is evident.