Few investigations have simultaneously assessed concordance between youth and parent ratings of posttraumatic stress disorder (PTSD) symptoms and functioning. Randomly sampled adolescent injury survivors ages 12–18 and their parents were assessed on the inpatient ward and again at 2, 5, and 12-months postinjury (N = 99). Adolescent PTSD symptoms and functioning were rated by both adolescents and parents. Parent PTSD was also assessed; 27% of parents endorsed symptoms consistent with a diagnosis of PTSD over the course of the year after adolescent injury. The PTSD positive parents demonstrated significantly greater discordance in ratings of adolescent PTSD symptoms, family cohesion, and mental health functioning. These findings suggest caution in clinical and policy applications of parental ratings of adolescent symptomatic and functional outcomes after injury.