The study aims to examine the qualities of a good English as a Foreign Language (EFL) Teacher perceived by English language teachers and EFL students at a Vietnamese university. The study also investigates how teachers and students perceived the qualities of a good EFL teacher and differences in teachers' and students' views on these qualities. Mixed-method research was employed under the participation of 22 teachers of English and 80 English-majored students. The study was based on the English Teacher Competency Framework (ETCF) by the Ministry of Education and Training (MOET, 2008) in Vietnam. The results revealed that both teachers and students perceived knowledge of language teaching as the most considerable (M=4.28/5.0, SD=0.38). Although teachers' and students' perceptions had major similarities, there were some differences between their views from quantitative and qualitative findings. From the findings, it is suggested to provide a reference and standards for language teachers, teacher trainers, and policymakers regarding EFL teacher training programs in every educational institution.