The aim of this study was to investigate the relationship between personality dimension and academic achievement of high school girls in district five of Tehran. The research method was descriptive-correlational. The study population included all girls of high school in district 5 of Tehran with 5,000 people. According to Cochran sample size, the number sample size of this study was 356 respondents from which the method of random sampling was selected. An instrument of collecting data was a

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... tionnaire of five personality traits. To analyze the data, descriptive statistics (charts, tables, mean, and standard deviation) and inferential statistics (Pearson correlation and multiple regression analysis) were used. Research findings showed that there was a positive and significant relationship between personality trait and academic achievement of high school girls in district five of Tehran. The results of multiple regression analysis also indicated that there was a significant relationship between personality dimensions (extraversion, flexibility, being conscientious, being consistent) and academic achievement. This means that personality dimensions significantly have the ability to predict their academic achievement. There is a negative and significant relationship between subscales of neuroticism and academic achievement. Based on the results, educational achievement of people is affected by their mental state. Therefore, most of mental and personality issues of the students and iotaoitacitca mental consultation centers necessary are necessary for them.