Reinvigorating STEM with Project-Based Learning is a practical guide for secondary school STEM educators and instructional coaches who want to design hands-on learning experiences that cultivate belonging without abandoning the strong teaching practices they already use. Project-Based Learning (PBL) is a widely embraced approach for engaging students in meaningful, real-world STEM learning, but well-intentioned projects too often fall short of their transformative promise. This book empowers educators to integrate PBL into their upper middle and high school math and science classrooms in ways that are accessible, adaptable, and rooted in high-quality instruction. Prioritizing equity, rigorous standards, and authentic community-centered learning, the authors' original framework and example projects support discipline-rich STEM teaching and deepened engagement by learners. By the end, you will find that PBL is not an add-on but a comprehensive approach to reinvigorate your STEM classroom.