The aim of this study was to investigate the relationship between the five personality traits and emotional intelligence and academic achievement. The study was conducted through The NEO-FFI questionnaire and Bar-on questionnaire using cluster sampling of 450 male students of seminaries at level 1(the second to sixth grade) in Tehran in the academic year 2014-2015. To measure the academic achievement of students, their averages in the final three semesters were evaluated. Data was analyzed by using descriptive and inferential statistics of average, standard deviation, frequency, correlation coefficient, t-test and multiple regression. The results showed that there is not a significant relationship between the academic achievement and the traits of extraversion and agreeableness, but there is a positive correlation between the academic achievement and the traits of the openness to experience and conscientiousness and a negative correlation between the academic achievement and the traits of neuroticism. The trait of openness to experience (0.133) and the trait of conscientiousness (0.910) had a positive correlation with the academic achievement, and the trait of neuroticism (-0.865) had a significant reverse correlation at a significance level of less than 0.01 with the academic achievement. Further, the results showed that the correlation coefficient calculated between all the components of emotional intelligence and the academic achievement is significant and positive. The total score of emotional intelligence and academic achievement (0.845) is a significant correlation at a significance level of less than 0.01.