Master of Public Health - MPH / Gay men and other men who have sex with men (MSM) and a subset within this group who are people who inject drugs (PWID) face difficulties when trying to access humanimmune deficiency virus (HIV)/ anti-retroviral treatment (ART) services and adhere to ART, due to the intersecting forms of oppression they face. Current interventions to address adherence to ART are mostly bio-medical in nature, and support the presumption that individual-level factors are the most pertinent barriers to adherence to ART. This mini-thesis presents findings from a qualitative study that explored individual, health systems and structural factors that shape experiences of adherence to ART amongst gay men and other MSM and a subset within this group who are PWID