The Automotive Cybersecurity Engineering Handbook introduces the critical technology of securing automotive systems, with a focus on compliance with industry standards like ISO 21434 and UNECE REG 155-156. This book provides automotive engineers and security professionals with the practical knowledge needed to integrate cybersecurity into their development processes, ensuring vehicles remain resilient against cyber threats. Whether you're a functional safety engineer, a software developer, or a security expert transitioning to the automotive domain, this book serves as your roadmap to implementing effective cybersecurity practices within automotive systems. The purpose of this book is to demystify automotive cybersecurity and bridge the gap between safety-critical systems and cybersecurity requirements. It addresses the needs of professionals who are expected to make their systems secure without sacrificing time, quality, or safety. Unlike other resources, this book offers a practical, real-world approach, focusing on the integration of security into the engineering process, using existing frameworks and tools. By the end of this book, readers will understand the importance of automotive cybersecurity, how to perform threat modeling, and how to deploy robust security controls at various layers of a vehicle's architecture.