Numerous studies showed that general cognitive ability (GCA) is a reliable predictor of academic achievement. In addition, parental involvement in their children's academic development is of major importance in early adolescence. This study investigated the incremental validity of parental involvement over GCA in the prediction of academic performance within the domains of math and language. We examined four dimensions of perceived parental involvement: autonomy supporting behavior, emotional responsivity, structure, and achievement-oriented control. Results from a sample of 334 adolescents ("mean age" = 12.4, SD = 0.9, "range" = 10-14 years) showed that GCA was the strongest predictor of achievement in both domains. While autonomy support and emotional responsivity had no predictive value over GCA, high levels of achievement-oriented control and structure were detrimental to academic success. These findings provide new evidence for the significance of parental involvement in their children's achievement in school even after the most powerful predictor of academic success has been accounted for. (Contains 1 table and 2 figures.)