Scholars have distinguished conceptually between multiple forms of social withdrawal among children and adolescents, but this distinction has yet to be investigated fully during emerging adulthood. Therefore, the overarching goal of this study was to employ a person-oriented approach to examine differences between subtypes of withdrawal on indicators of internalizing issues and relationships in emerging adulthood. The sample for the current study ("M[subscript age]" = 19.60, "SD" = 1.85, "range" = 18-29) consisted of 791 undergraduate students (548 women, 243 men). Results revealed that three distinct forms of social withdrawal (shyness, avoidance, unsociable) can be identified in emerging adulthood, with each one uniquely related to indices of maladjustment in regard to internalizing problems and relationship difficulties. In general, both shy and avoidant individuals reported more problems of an internalizing nature and in their relationships. Far fewer problems appear to exist for unsociable individuals. (Contains 4 tables.)