Learner autonomy plays a vital role in self-enhancing language learning quality. Nevertheless, ESL\EFL teachers’ perceptions of learner autonomy and their teaching strategies for learner autonomy enhancement vary from one context to another. This study aimed to explore EFL teachers’ perceptions of learner autonomy and the use of teaching strategies to promote learner autonomy at high schools in a Province, Vietnam. The mixedmethods approach was employed in this study to collect data from a cohort of 106 high school teachers of English from 14 high schools who participated in the survey, and 20 of them were selected purposively for the individual interviews. The quantitative data were processed by the software SPSS, while the qualitative data were analysed using content analysis. The findings revealed that the participants had good understanding of learner autonomy in three aspects including decision-making ability, learner independence, and learning psychology, and they usually applied teaching strategies for the promotion of learner autonomy among their students relating to decision-making ability (e.g., making their own decisions and choosing learning materials), learner independence (e.g., developing their own study plans, identifying their own needs, delving into language concepts on their own, and recommending autonomous learning strategies for obtaining their own goals) and learning psychology (e.g., evaluating their own learning, reflecting on their own learning, and monitoring their progress).