This study investigated ego developmental differences in adolescent academic orientations and academic achievement. A sample of 142 male and female high school students completed the Washington University Sentence Completion Test and self-report measures assessing academic locus of control, learning orientation (LO), and grade orientation (GO). With increasing ego development, adolescents demonstrated increased internal academic locus of control, stronger LOs, diminished GOs, and higher class rank. Regression analysis indicated that ego level was a significant predictor of academic achievement after controlling for the effects of verbal intelligence and gender. Implications for fostering academic success through theoretically relevant interventions are discussed.