Background and Objectives: Providing self-awareness skills training to adolescents and incorporating religious teachings into these programs can positively affect this sensitive age group. This study aimed to investigate the effectiveness of self-awareness skills training based on monotheistic primordial nature (Fitra) on students’ moral development and spiritual well-being. Methods: This study utilized a quasi-experimental design, incorporating pre-test, post-test, and two-month follow-up assessments with a control group. The statistical population was female high school students in Shadegan, enrolled during the 2022-2023 academic year. Through convenience sampling, 30 participants were selected and randomly assigned to either an experimental group (n=15) or a control group (n=15). The experimental group received an 8-session, 90-minute self-awareness skills training program grounded in monotheistic primordial nature, while the control group received no intervention. Data were collected using the Spiritual Well-being Scale and the Moral Development Scale, analyzed via SPSS software, version 27 with repeated measures analysis of variance (ANOVA) and Bonferroni post-hoc tests Results: The results indicated that self-awareness skills training based on the monotheistic primordial nature significantly increased the mean scores of spiritual well-being and moral development in the experimental group compared to the control group. These positive changes were observed at the initial post-intervention measurement and sustained at the follow-up assessment two months later (P<0. 001). Conclusion: This study found that self-awareness training, based on monotheistic primordial nature (Fitra), significantly improved spiritual well-being and moral development in female high school students, with effects sustained at two-month follow-up. Educational planners should consider integrating this program to enhance student development.