The book "Piezoelectric Transducers and Applications" offers a comprehensive and updated examination of the principles and applications of piezoelectric transducers. The second edition addresses new technological advancements and application areas that were not covered in the first edition. It is aimed at students and researchers who wish to engage with this complex and interdisciplinary topic. The content is both pedagogically structured to convey fundamental concepts and detailed enough to illuminate specific research aspects. The topics covered range from resonant sensors to chemical and bio-sensory applications, as well as broadband ultrasound systems. This comprehensive resource is designed to highlight the diverse applications of piezoelectric devices and inform readers about the current state of the art.