The study aimed to know the level of post-primary education students in the Sultanate of Oman with coexistence and its repercussions, and to achieve the objectives of the study, the researcher employed the descriptive curriculum; by collecting data using an electronic questionnaire consisting of three tools: the cognitive test consists of 32 questions distributed over 5 axes, and the trend scale consists of 30 paragraphs distributed over 6 axes. The results showed good levels of among post-basic education students’ awareness of coexistence and its repercussions, as the attitude scale was high compared to the knowledge and behavioural attitudes, which was at a good level, The study also found that there were statistically significant differences in knowledge and general average in favor of females, while there were no statistically significant differences in behavioural attitudes and tendencies. The study also found that there were statistically significant differences in the knowledge, attitudes and expected behavioural attitudes of among post-basic education students towards coexistence according to the state variable at the level of significance (0.05) was found to be in favor of students in the Wilayat of Bowsher and Muttrah. The study recommended working to intensify the amount of knowledge to enhance students’ knowledge of coexistence and the mechanisms for achieving it by employing all sources of knowledge, developing mechanisms to enhance students’ awareness of all forms of coexistence and their repercussions to build a generation aware of all these forms. Based on what was achieved in this study, the researcher proposes to conduct studies on the level of university students’ awareness of the concept of coexistence and study the differences according to the variables of type, specialization and geographical region, and a study on the role of teachers in promoting the concept of coexistence among students at various educational levels.