The dominance of English as a global lingua franca has significantly influenced educational materials worldwide, often reflecting underlying patterns of linguistic imperialism. This study conducts a comparative analysis of TEFL textbooks from Iran and Lebanon to examine how cultural, linguistic, and ideological content is represented. Using Content Analysis, the research highlights stark contrasts between the Prospect Series, which is fully localized to Iranian cultural and ideological values, and the Themes Series, which incorporates a mix of Western, localized, and neutral content. Quantitative findings reveal that the Prospect Series avoids any form of linguistic or cultural imperialism, while the Themes Series contains a significant proportion (40%) of imperialistic themes, overshadowing localized content. The results underscore the divergent educational philosophies of the two countries, with implications for policy and pedagogy in developing culturally inclusive TEFL materials. The study contributes to the understanding of linguistic imperialism and offers actionable insights for creating balanced educational resources.