This study investigates the strategies employed by Vietnamese EFL teachers to enhance emotional intelligence (EI) in adult learners within online learning environments. Utilizing a qualitative research design grounded in Mayer and Salovey's model of emotional intelligence and Knowles's theory of andragogy, the study involved semi-structured interviews with ten EFL teachers from two Vietnamese educational institutions. The thematic analysis of the interview data revealed several key strategies: reflective practices, interactive activities, technology integration, personalized feedback, collaborative learning, integration of real-life scenarios, self-awareness activities, development of emotional vocabulary, and creation of emotionally supportive environments. The findings illustrate a multifaceted approach to enhancing EI in online language education, highlighting the innovative adaptation of traditional classroom strategies to the digital realm. The study's unique contribution lies in its focus on the Vietnamese context, providing insights into how cultural nuances shape online teaching strategies for EI enhancement. The implications of these findings are significant for the field of EFL education, suggesting the need for holistic teaching approaches that integrate emotional competencies alongside linguistic skills.