The book, 3D Printed Smart Sensors and Energy Harvesting Devices: Concepts, fabrication, and applications aims to explore the state-of-the-art integration of 3D printing technology in smart sensing and energy harvesting systems. By presenting a comprehensive overview of the field, the book seeks to bridge the gap between theoretical knowledge and practical applications, serving as a valuable resource for researchers, engineers, and students. The scope encompasses the entire value chain of 3D-printing-based sensors and devices development. Practical insights into designing and fabricating smart devices are provided, particularly emphasizing integrating chemical functionalities, electrodes, and advanced circuitry. This approach showcases state-of-the-art research and identifies challenges and future opportunities, fostering innovation in this dynamic field.