This study examines whether there is a significant AIDS stigma gap, and it reveals causes and consequences of the perceptual gap. An analysis of the survey data collected to evaluate the impact of 2011 AIDS campaign in Korea revealed that there existed the perceptual gap between personal stigma and attributed stigma and that only AIDS knowledge was a significant predictor of the perceptual disparity. Results also showed that AIDS stigma gap could predict support for prohibition on prostitution, but not support for prohibition on same-sex marriage.