The support deterioration model of depression states that stress deteriorates the perceived availability and/or effectiveness of social support, which then leads to depression. The present study examined this model in adolescent depression following parent-perpetrated maltreatment and peer-perpetrated bullying, as assessed by a rigorous contextual interview and rating system. In 101 depressed and nondepressed community adolescents between the ages of 13 and 18 (M = 15.51, SD = 1.27), peer bullying and father-perpetrated maltreatment were associated with lower perceptions of tangible support and of belonging in a social network. These forms of support mediated the association of bullying and father-perpetrated maltreatment with greater depression severity. In contrast, mother-perpetrated maltreatment was associated with "higher" perceptions of tangible support. (Contains 3 tables, 2 figures and 6 footnotes.)