The authors examined whether perceptions of parents and personal mental health significantly influenced perceptions of school achievement and enjoyment in a large sample of Canadian adolescents. Responses from more than 10,000 Canadian adolescents in the Health Behaviour in School-Aged Children (HBSC) survey were used to create a Parental Support Index, a Mental Health Index, and a School Index. They found a significant, medium-sized effect between the parent index and the school index. They found a similar but smaller effect for mental health. The findings were consistent for adolescents across the 10 southern provinces. However, among adolescents from the two northern territories the Parental Support Index was not significant whereas demographic factors and mental health played a larger role in predicting scores on the School Index. (Contains 4 tables.)