This quantitative study discusses the mental health of eleventh grade students in the Wilayat of Rustaq, Sultanate of Oman. The problem has emerged with the existence of many economic, political and societal pressures on students in our current age, which may affect their performance, aspirations and outlook for the future, and may make attention turn to preventive and therapeutic solutions to achieve mental health. The study aims to diagnose the level of mental health of the study sample of students, and to know the differences in mental health between males and females, and the relationship of students' mental health with the monthly income of the family. The researcher used the descriptive and analytical method of collecting data according to the Mental Health Scale prepared by Abdel Khaleq (2011). Data were analyzed according to the descriptive analysis approach, T-Test and ANOVA, using SPSS software. The results of the study revealed that: the level of mental health among the students was at a high level, where the general average was (3.96) with a general standard deviation (0.96). The findings indicated that: there were no differences in the results of the study due to the variables of gender and the family monthly income.