Written by some of the founders of complexity theory and complexity theories of cities (CTC), this Handbook expertly guides the reader through over forty years of intertwined developments: the emergence of general theories of complex self-organized systems and the consequent emergence of CTC.Examining studies from the end of 1970 through to the current leading approach to urbanism, planning and design, the book provides an up-to-date snapshot of CTC. Insightful chapters are split into five parts covering the early foundations of the topic, the evolution of towns and cities and urban complexity, the links between complexity, languages and cities, modelling traffic and parking in cities, and urban planning and design. The Handbook on Cities and Complexity concludes with the contributors' personal statements on their observations of COVID-19's impact upon global cities. This book will be an invaluable resource for those researching cities and complexity and also for scholars of urban studies, planning, physics, mathematics, AI, and architecture.