The study aimed at identifying the relationship between attachment patterns and mental health among students in grades 10 and 11 in the schools of North Sharqia Governorate in the Sultanate of Oman. The study was conducted on a random sample of students in grades 10 and 11 with a rate of (14%) of the study population to apply the study tools to them. There were (1000) students from the tenth and eleventh grades, as the number of females was (570), while the number of males was (430). The study used the following tools: Attachment scale by Abu Ghazal and Jaradat (2009), and the scale of mental health (Arabic Scale of Mental Health (ASMH)) prepared by Ahmed Abdul Khaliq (2016). The study embraced the correlative descriptive method, and the study concluded the following results: - The type of safe attachment was in the first place with a moderate degree, while the avoidance pattern was ranked second with a moderate degree, and the anxious attachment pattern was in the third degree with a moderate degree. The total number of attachment patterns was with a moderate degree. - The level of mental health among students in grades 10 and 11 in the schools of North Sharqia Governorate was high. - There was a statistically significant positive correlation between the dimension of safe attachment and mental health measures. There was a statistically significant negative correlations between the dimension of avoidance attachment and mental health measures. There was no statistically significant correlations between the dimension of anxious attachment and mental health measures. - There is no statistically significant correlation between attachment pattern and mental health among the students of grades 10 and 11 in North Sharqia schools. There were no statistically significant differences in the level of attachment patterns, and the level of mental health among the students of grades 10 and 11 in the schools of North Sharqia governorate and this was according to the following variables: (gender, grade, birth order, parental relationship, and student housing stability).