%0 Journal Article %T Teacher Knowledge Sharing and Reflection as Predictors of Teacher Professional Development: A Case of Iranian TEFL Faculty Members. %A Parhamnia F %A Farahian M %J J Psycholinguist Res %V 52 %N 6 %D 2023 Dec 25 %M 37356063 %F 1.315 %R 10.1007/s10936-023-09982-z %X Despite the accumulated body of research on teachers' professional development few have offered a relationship between professional development and knowledge sharing or reflective practice. We investigated whether Iranian Teaching English as a foreign language (TEFL) teachers' reflective teaching and their knowledge sharing can predict their professional success. To answer the research questions a quantitative approach was utilized. Then, 264 faculty members through available sampling were recruited using three questionnaires, namely reflective teaching measurement scale by Akbari et al. (System, 38(2): 211-227, 2010), teacher professional development scale by Soodmand Afshar and Ghasemi (J Teach Lang Skills 37: 169-210, 2018), and Teachers' knowledge sharing behavior by Ramayah et al. (Eval Rev 38(2): 1-28, 2014). Findings showed that knowledge sharing has a significant relationship with professional development (Pā€‰<ā€‰0.001). In addition, teachers' reflective practice has a significant relationship with professional development (Pā€‰<ā€‰0.001). Based on the findings we suggest that TEFL teachers should promote their knowledge sharing and reflection to improve their professional development.