This research investigated how individuals classify and distinguish among stigmatized groups. In Study 1, participants sorted 54 stigmas based on perceived similarity and then provided evaluations. Cluster analysis revealed 7 stigma clusters, including physical disability, mental disability, economically disadvantaged, social deviants, physical appearance, sexual identity, and racial identity. Multidimensional scaling showed that the stigmas differed on dimensions of social undesirability, controllability, and general pity. In Study 2, participants provided evaluation ratings of stigmas across 6 situations. Results confirmed the validity of the 7-cluster solution.