Professional identity is the main key construct that cannot be separated from teacher career development. Despite the large number of studies examining professional identity, its relationship with work-related behavior at career stages and their psychological aspects such as self-efficacy has not been extensively investigated, especially in Indonesia. The purpose of this study is to look at the correlation between teachers' professional identity and their general self-efficacy. Participants are EFL instructors from the primary to university level in Yogyakarta. The mixed method framework was used to acquire the data with a questionnaire and interview. An altered version of the General Self-Efficacy (GSE) and Teacher Professional Identity Scale (TPIS) questionnaire was used to gather quantitative data. According to the findings of this study, the average score for General Self-Efficacy (GSE) is 40.1333, while the average score for Teacher Professional Identity (TPI) is 55.8667. The Pearson correlation test findings show a modest link between GSE and TPI in this study, with a correlation value of 0.459.