Despite the benefits of an efficient antiretroviral therapy (ART), HIV/AIDS epidemic still represents the most seriousaffection worldwide that negatively impacts people's quality of life (QoL). As no studies exist on QoL in Tunisia, the aim of the present work was i: to assess, based on WHOQOL-HIV BREF tool, the perception of QoL of people living with HIV (PLHIV) receiving ART and ii: to investigate the relationship between socio-demographic features, disease-related variables and QoL domains' mean scores. Methods: This cross-sectional study was conducted at the department of infectious diseases of F. Bourguiba Teaching Hospital in Monastir, Tunisia. One hundred and five participants receiving ART were involved. QoL assessment was based on the WHOQOL-HIV Bref including six domains with 29 items with scores ranged from the lowest (4) to the highest (20). Results were reported as frequencies and means (±SD). The Student's t-test for independent samples and the one-way ANOVA were performed to assess differences in QoL mean scores. Linear regression analysis was used to investigate predictors of QoL. The confidence interval was set at 95%. Results: Clients' mean age was 39.20±10.18 years old with a male to female sex ratio of 3.12. Low mean scores were seen with the environment (12.34±2.90), social relations (12.58±3.94) and psychological domains (12.76±3.31), and moderate mean scores were noted for the physical (14.11±3.52), the spiritual (14.05±3.78) and the level of independence (13.98±3.57) domains. Regression analysis showed that health status and feeling healthy were related to all QoL domains and that profession, marital status and the presence of a confident person were related to environment and spiritual domains. Conclusion: QoL of PLHIV on ART is affected. Concrete measures and strategies should be undertaken by healthcare stakeholders to improve QoL determinants.