This study aimed to compare the underlying measures of male and female high- school students’ social capital in terms of regional variations and gender and investigate the relationship between those measures and the students' foreign language (FL) achievement. To this end, a number of 904 third-grader high school students (278 male and 626 female) from two educational districts (privileged district (PD) and less-privileged district (LD)) participated in the study. They filled out the Student Social Capital Questionnaire and took an English language achievement test. The results showed that the students in the PD outperformed their counterparts in the LD. Furthermore, group statistics and t-test results suggested variations among the groups of students in terms of such factors as mothers’ involvement, institutional trust, intergenerational closure, and parents’ educational aspiration. Pearson product-moment correlation indicated that there was a significant negative correlation between male and female students' participation in social networks and religious activities on the one hand, and their foreign language achievement on the other hand. However, there was a significant positive correlation between intergenerational closure and parents’ educational aspiration and female students' English scores on the S-test. The findings have implications for families and school members to provide students with hopeful and positive aspirations and intimate family environments and learning environments, which can enhance their FL achievement.
