As the main applicable language resources in classrooms, textbooks provide the primary source of information, and they serve the foundation of instruction and transfer the curriculum objectives. Therefore, teachers should be conscious in choosing the right textbooks and activities for their students. The purpose of this study is to investigate one series of commonly used TPSOL textbooks in light of Multiple Intelligences Theory. Three Textbooks of Farsi Biyamuzim series were analyzed using a MI checklist developed by the present researchers based on the review of the related literature and frameworks of the theory. Careful analysis of the activities revealed that textbooks mostly catered for verbal/linguistic, visual/spatial, logical/mathematical, and interpersonal intelligences. The least dominant intelligence were intrapersonal, musical, and naturalist intelligence types and no example of the bodily/kinesthetic intelligence was observed in the analyzed textbooks' activities. In addition, the results of the study did not show any significant effect of proficiency level on application of intelligence types in textbooks. The findings of the study suggest the administrators and material developers to consider the necessity of applying various intelligence types in designing TPSOL textbooks.