This handbook provides a state-of-the-art, comprehensive overview of the expanding field of urban biodiversity. The field of urban biodiversity has emerged from within the broad discipline of urban ecology in the past two decades and is now a significant field in its own right. In view of this, the Routledge Handbook of Urban Biodiversity presents a thorough treatment of this field detailing the history of urban biodiversity, theoretical foundations, current state of knowledge, and application of that knowledge. This volume contains interdisciplinary and global contributions from established and early career academics as well as professionals and practitioners, addressing two key fields in urban biodiversity: fundamental research focused on answering questions about the mechanisms explaining the distribution of species among and within cities; and applied research and work by practitioners to address concerns about urban biodiversity conservation, restoration, planning, design, and public involvement.