INTRODUCTION Understanding differences in knowledge and behaviors among men who have sex with men (MSM), men who have sex with women (MSW), and women, is critical to tailor HIV treatment. We investigated these differences among an international sample of people living with HIV (PLHIV) in 25 countries. METHODS Data came from the 2019 Positive Perspectives Study, an online convenience sample of PLHIV in 25 middleand high-income countries. Participants were categorized as MSM (n=1018), MSW (n=479), or women (n=696), based on self-classified gender and sexual orientation. Descriptive and multivariable analyses were performed (p<0.05). RESULTS Mean age was 43.4 years among MSM, 36.6 among MSW, and 41.0 among women. Overall, 24.2% [116/479] of MSW reported suboptimal health on all four domains assessed (sexual/mental/physical/overall), significantly higher than MSM (18.0% [183/1018], p=0.005), but similar to women (22.8% [159/696], p=0.585). Overall, the median number of reasons reported for missing HIV medication ≥1 time in the past month was 7, 2, and 1 for MSW, women, and MSM, respectively. The percentage reporting viral suppression among MSW (57.0% [273/479]) was significantly lower compared to both MSM (89.2%