This book presents a collection of chapters on modern bioelectrochemistry, showing different aspects of materials and electrode processes. The chapters cover biomimetics, bioelectrocatalysis, large-scale biodevices manufacturing, organic semiconductors for biorecognition, biofunctionalization, conducting polymers, carbon-based materials and 3D printed bioelectrochemical devices. They provide relevant bibliographic information for researchers and students interested in biomimetics applied in electrochemistry with impact in bioelectrocatalysis, large-scale deposition techniques applied to biodevices manufacturing and organic semiconductors as support material for electrochemical biorecognition. This book also presents insights on advantages and properties of biofunctionalization, conducting polymers with carbon-based materials in biosensors applications and progress on 3D printed electrochemical devices for sensing and biosensing of biomarkers.