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This paper reports high school teachers’ attitudes toward English as a lingua franca (ELF) and their classroom EFL teaching practices in a province in Vietnam. This mixed-methods study involved 109 high school teachers from 11 high schools in answering the questionnaires, and 22 of them were invited for semi-structured interviews. The findings indicated that high school teachers had positive attitudes toward ELF in three attitude components, including cognitive, affective, and behavioral attitudes. Additionally, they integrated activities for the promotion of ELF to their students in relation to eight sub-variables from cultural knowledge, vocabulary, pronunciation, and grammar to four language skills of students. Although facing difficulties in designing activities for ELF promotion, high school teachers still tried their best to introduce the existence of ELF and help their students accessible to the use of ELF in language learning. This study featured some limitations, but it can be of reference for the research context and other similar ones.
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