Objectives This study investigated the association between extrovertㆍintrovert tendency and self-esteem by gender among high school students [n=340]. Methods Extrovertㆍintrovert tendency was measured by using MBTI (Meyers-Briggs Type Indicator) and then, the association between extrovertㆍintrovert tendency and self-esteem tested by pearson coefficient and simple regression analysis among them. Results The result of pearson coefficient value indicated that extrovert tendency affected increasing self-esteem both groups [the boys (-0.251), (p<0.01), the girls (-0.187), (p<0.01)]. The simple regression analysis showed self-esteem increased with extrovert tendency in the boys (B=-0.347), (p<0.01) and the girls (B=-0.245), (p<0.05) as well. Conclusions Self-esteem of high school students showed a association with higher the extrovert tendency. Therefore, we need to find diverse solutions to increase self-esteem through the improvement of extroversion.