Globalization has accelerated the growth of English and created a need for several changes in English language teaching (ELT), one of which is related to the role of ELT materials in facilitating interaction across cultures. Considering the fast growing importance of cultural content in ELT, this study explores issues of cultural presentation in Thai secondary school ELT coursebooks. The purpose of this study is twofold: first, to analyze cultural content presented in visuals and reading texts; second, to investigate teachers' attitudes toward cultural presentation in ELT coursebooks. The coursebook sample included seven approved ELT coursebooks entitled "Bridge 1," "English in Mind 1," "Messages 1," "Motivate! 1," "New World 1," "Time Zone 1," and "Your Space 1." The findings suggested that native speakers' contexts were dominantly portrayed in both visuals and reading texts in all the coursebooks except "Time Zone 1," which yielded a great deal of non-native speakers' contexts. Nevertheless, Thai cultural context was completely absent from the reading-focused activities, and only a few pictures presenting Thai culture were identified. The questionnaire findings revealed that Thai secondary teachers are ready to embrace the intercultural aspects of ELT, as the overwhelming majority of respondents' opinions signified the shift toward localized and culturally diversified materials.