Bio-based polymers are polymers derived from biodegradable biomass. The ongoing threats posed by the climate crisis, dependence on fossil fuels, and the issue of plastic waste have sparked a growing interest in bio-based materials, and the current drive towards developing new materials for various applications is heavily influenced by interfacial processes as well as ecological considerations. This reference text will provide a comprehensive and interdisciplinary overview of bio-based polymers at interfaces, exploring the latest cutting-edge developments and applications from a materials science, physical science, and polymer science perspective.