This study examines the reliability of interparental and peer ratings of adolescent delinquency with adolescent self-reported delinquent behaviors, assessed using the Child Behavior Checklist, Problem Behavior Inventory, and Youth Self-Report of delinquency. Data were collected from a sample of 184 teens and their parents (177 mothers, 108 fathers), as well as three peer groups (closest friend, close friend, acquaintance). Simple correlations were conducted between adolescent self-reported delinquency and the multi-reporters’ ratings. An analysis on gender of adolescent effects are also highlighted. Results reveal significant differences in interparental rating reliability on adolescent delinquency. The peer’s level of closeness with the adolescent also affects their rating reliability. Gender effects were clearly present, with differences in parent by gender of adolescent ratings. These findings illustrate the differences in reliability among multiple reporters, both between parents and types of friends.