Key Message
This study explores the relationships between HIV knowledge, professional ethics, institutional support, perceptions of HIV/AIDS, and HIV/AIDS-related stigma among healthcare workers in West Sumatra, Indonesia. Using a PLS-SEM model, the analysis reveals that HIV knowledge and professional ethics significantly reduce HIV-related stigma, while the effects of perceptions and institutional support are less pronounced. The model explains 40.8% of the variance in stigma, highlighting the critical role of improving HIV knowledge, fostering ethical conduct, and strengthening institutional support. These findings suggest that comprehensive strategies addressing these factors are essential to reducing HIV/AIDS stigma in healthcare settings.