This study aimed to investigate the mindfulness level in terms of gender and academic achievement and its relationship to moral anxiety among adolescents. The study was conducted on a sample consisted of (390) adolescents’ students in Al-Salt city, Jordan. Two scales were used in the study, the mindfulness scale, and the moral anxiety scale. The study found that female adolescents have higher mindfulness levels compared to male adolescents who recorded a medium level and that the adolescents with higher academic achievement have higher mindfulness levels compared with those who have lower academic achievement. Furthermore, results exhibited a negative statistically significant correlation between mindfulness and moral anxiety as the mindfulness constituents (non-judging of experience, acting with awareness, and non-reactivity to inner experience) contribute to moral anxiety reduction among adolescents.