Purpose: With the latest developments in the disciplines of knowledge and learning theories, physical education (PE) teachers are encouraged to exercise their expertise to introduce and incorporate science, technology, engineering, and mathematics (STEM) in PE curriculum as appropriate to enhance the learning and teaching effectiveness and enrich students’ horizons. This study explored three secondary schools and three primary school PE teachers’ perceptions of STEM integration in current Hong Kong PE Curriculum through interviews. The approach was constructivist and data were analyzed according to the recommendation and strategies to promote STEM education in recent curriculum updated in Hong Kong (Curriculum Development Council, 2015). Methods: Three secondary school and three primary school PE teachers were purposively invited to participate in this study. Each participant completed three interviews to investigate their past experiences, then present perceptions, and lastly reflections on how to integrate STEM in current PE curriculum. Constant comparison and analytic induction were used to organize and categorize the data. Results: Teacher perceptions were outlined individually and then compared. The teachers shared similar perceptions related to time constraints, purpose of PE, the effects of STEM integration, concerns about collaboration with other subject teachers, rapport with students, and curricular resources. Perceptions aligned well with the recommendation and strategies to promote STEM in PE in Hong Kong. Besides, enrich learning activities could be designed for students to extend their learning experiences in PE. Misconceptions of STEM education included incomplete understanding of technology and engineer education, and viewing the use of instructional technology as STEM education. Conclusions: The findings suggest that support from tertiary institution, sharing among PE teachers and resources in teaching, and professional developments are needed