The relevance of metalinguistic knowledge in effective teaching of the four language skills is evident. As such, the present study sought to determine the degree of Iranian EFL teachers’ metalinguistic knowledge by focusing on the role of academic degree in English Language Teaching (ELT) and teaching experience. The study drew on a mixed-methods research design, and the data were collected through a questionnaire and a semi-structured interview, exploring teachers' perceptions and evaluations of metalinguistic knowledge. Additionally, in order to evaluate the declarative knowledge of teachers regarding their grammatical awareness, a test of English Grammar Knowledge was administered among 94 novice and experienced EFL teachers with and without an academic degree in ELT teaching in private language institutes. The results of the questionnaire and interview indicated that while the importance of having grammatical knowledge was evident for participants, experienced teachers displayed more positive views toward grammar awareness. Furthermore, the teachers' performance on the grammar test showed that while formal education helps teachers improve their knowledge, it is not the only determining factor for high levels of declarative knowledge of language. On the contrary, teachers' background knowledge was found to result in high levels of metalinguistic knowledge. Additionally, the results revealed that years of teaching experience does not determine the levels of teachers’ metalinguistic knowledge. The study provides implications for EFL teachers and teacher trainers.
