This study examined longitudinal patterns of affiliation with delinquent friends during late childhood and early adolescence, i.e., from ages 10 through 13, in a sample of 376 participants of both genders. Four groups with distinct affiliation profiles were found: an early affiliative group, a late affiliative group, a declining group (i.e., a group that affiliates with delinquent friends early on but much less so thereafter), and a group of children who did not affiliate with delinquent friends throughout the period covered in this study. There was also a fifth group of children who had no mutual friends throughout. The proportion of boys and girls varied in some groups but not in others. Participants' own delinquency and depression trajectories as well as other behavior-, peer-, school-, and family-related correlates were examined in association with group membership through the use of growth curves analysis. The results are discussed in light of prevalent theories about the role of delinquent friends with respect to externalizing and internalizing problems.