This book showcases current science education research in Canada, from Grade 8 to university. It provides a rich portrait of science teaching and learning at the secondary and tertiary levels across content areas and research methodologies. Research contexts include chemistry, oceanography, physics, and STEM; research approaches include action research, case study, mixed methods, and document analysis. Chapters build upon themes that emerged from our previous Springer book Science Education in Canada (2019) including environmental education (e.g., ocean literacy, place-conscious pedagogy), Indigenous perspectives (e.g., water stewardship), and assessment (e.g., formative assessment practices), and represent a cross section of the current mosaic of science education research in Canada in high school settings (and beyond). This book, when taken in conjunction with its companion volume Exploring Elementary Science Teaching and Learning in Canada (2023), enables readers to develop an in-depth understanding of current science education research across the country. Although this book reflects a Canadian perspective, its themes are of interest to both domestic and international audiences.