This book provides a comprehensive introduction to printed flexible sensors, covering key aspects such as main materials, printing technologies, sensor design considerations and their integration with electronics. It begins with a brief overview of sensor types and their performance measures before delving into various categories of PFS, including strain, force, pressure, proximity, temperature, humidity, optical, gas and chemical, biosensors, OFET sensors, and SAW sensors. Dr Viana compares the sensing mechanisms of printed flexible sensors and highlights their essential design parameters. Finally, the book explores technological challenges, performance limitations, scalability and sustainability concerns, and emerging trends shaping the future of flexible electronics. Presenting a cohesive approach to materials, printing techniques, sensor design and integration, and the main sensing mechanisms behind sensor response, the book is ideal for researchers, engineers, or technologists ready for a journey through the exciting advancements shaping the future of smart sensing.