Several factors directly or indirectly influence academic achievement of students. There is immense variation in students’ academic achievement due to individual differences. Therefore, every individual has different personality characteristics that influence life, especially students’ academic achievement. Thus, the current study investigates the influence of personality types A and B on academic achievement of university students. This study presents a descriptive design. Furthermore, a random sampling technique was used for the sample selection. The Anjum-Khalique Scale and students’ GPAs were utilized as research tools. Correlation, regression and t-test were employed for data analysis. Findings exposed that personality types A and B have overall significant impact on academic achievement of students. Significant academic achievement difference was found between male and female students of type B personality unlike type A personality. It is recommended that deficiencies in personalities may be taken into consideration by teachers, administrators, educators, curriculum developers and policymakers for improvement in academic achievement.