This study investigates teachers' perceptions on PLC implementation within religious-based secondary schools in the context of Malaysia. Using a pragmatic mixed-method approach, quantitative data were obtained from 610 teachers about principals' implementation and support for PLC implementation. Then, 16 senior teachers who have successfully participated in PLC practices were interviewed. The study reveals that teachers in the religious-based public secondary schools felt satisfied with their principals' implementation of PLC practices. This study is one of few studies explored the practical and theoretical implications of improving principals' initiatives and their strategies which benefit PLC practices across religious-based secondary schools in Malaysia.