Meticulous expert attention to the determination of the content and its explicit and implicit messages could facilitate a healthy and proper process of national identity development and enhancement among students. Therefore, the main issue addressed in this paper was the way the textbooks of social sciences, history, and Persian at middle schools dealt with national identity along with shortcomings involved. Research questions of this study were investigated using content analysis leading to eleven factors inducing religious dimension, political dimension, national values, national norms, cultural heritage, national legends, national symbols, geographical features, community subcultures, national pride, and international interactions. By and large, findings suggested that in certain textbooks some aspects of national identity were dealt with rather properly, in duding both religious and political dimensions. However, some other aspects of national identity were almost ignored, in duding national norms, national legends, community subcultures, national symbols, and international interactions. This study suggested revising the objectives and content of the courses at different levels with emphasis on the development of Islamic-Iranian identity.