Abstract: This study focuses on the influences of self-efficacy beliefs in English learning between male and female university students. There was a total sample of 128 university Non-English majors from Dong Nai Technology University in Bien Hoa city. The quantitative component used a questionnaire asking about students’ background and their self-efficacy beliefs in learning English. Ten students were individually interviewed to be able to clarify the reasons that affected their self-efficacy beliefs and their English performance. T-test was used to find out the gender differences in self-efficacy level and English achievement degree. The result showed that there was a positive relationship between self-efficacy and achievement. Differences between male and female students in their confidence levels and English learning performance were found. The thesis finishes with a set of recommendations for teachers to pay attention to the importance of self-efficacy because it influences learning English achievement.