The study provides evidence that maternal-reported stable behavioral inhibition (BI) across infancy and early childhood is associated with increased risk for clinically meaningful social anxiety disorder (SAD) diagnoses in adolescence. The finding has important implications for the early identification and prevention of social anxiety. Approximately 15 to 20 percent of children can be classified as behaviorally inhibited during early childhood. This temperamental style involves the tendency to show signs of fear, reticence, or wariness in response to unfamiliar situations and to withdraw from unfamiliar peers. This study extends existing literature examining temperament as a predictor of adolescent psychopathology by using multiple assessments for temperament in infancy and early childhood and following participants into adolescence, the period of greatest risk for SAD onset, and the point at which data demonstrate robust relatively stable trajectories or anxiety disorders into adulthood. Participants of the study consisted of 126 adolescents aged 14 to 16 years. Figure, tables, and references