Science, Technology, Engineering and Mathematics (STEM) education has continued to attract attention and sizeable funding worldwide. Given the important role that teachers play in the provision of quality STEM education, this chapter provides an overall landscape of STEM teacher education in China and Hong Kong. The chapter presents an overview of policies, practices and research in teacher education and professional development in STEM education that have been and continue to be implemented in Mainland China and Hong Kong for the purpose of supporting teachers to effectively implement STEM education. Literature from a range of sources, including discussion and research papers, government reports and policy papers with respect to STEM teacher education in Mainland China and Hong Kong have been selected. The analysis of policies and practices is useful to provide a review of what has been done and to inform new directions for teacher education for STEM education. Copyright © 2022 selection and editorial matter, John Chi-Kin Lee and Timo Ehmke; individual chapters, the contributors.