The purpose of this study is to compare the religious beliefs and problem-oriented coping style on mental health of grade-2 high school students. The statistical population of this study consists of all grade-2 high school students in Alborz Province, Iran. A total of 400 students (200 male and 200 female students) are selected as a sample using cluster sampling method. In this study, one questionnaire [1] is used to measure religious beliefs and another questionnaire (SCL90) (1996) is employed for mental health assessment. The collected data is analyzed using statistical software SPSS-19 and t-test. The results suggest that there is a significant relationship between the mental health of students and their religious beliefs. Religious beliefs have significant relationship with six mental health dimensions, i.e. aggression, anxiety, depression, paranoia, obsessive and phobic fears. Furthermore, the religious beliefs of students who have high levels of mental health are more than students with low level mental health. The religious beliefs of students, therefore, are considered important psychological structure in predicting students' mental health and they can be used in prevention and promotion programs of the mental health of students.
