This paper provides a comprehensive review of the research field of urban morphology: the study of urban form. Urban morphology is a growing field of cross-disciplinary research, attracting worldwide interest among scholars in architecture, geography and planning. It aims to decipher the physical form, the urban landscape or townscape of complex contemporary cities. This paper discusses the evolution of urban morphology, from its conceptual foundations in research on the physical form of urban areas. Interestingly, the roots of urban morphology can be traced back to different disciplines in different countries. This discussion will cast light on various research perspectives of urban morphology, as well as discussing similarities and differences between the geographical and the architectural approaches to urban form studies. This is followed by a closer look at the theories developed by Gianfranco Caniggia and MRG Conzen. Their work has been an inspiration for many practitioners and researchers, including Whitehand, Maffei, and Moudon to name a few. Finally, a schematic diagram is presented, which reflects the heightened activity of research on physical form that is currently occurring in several disciplines simultaneously, and showing the relationships between research traditions and authors. As the formation and development of the urban landscape becomes ever more diverse, it is necessary to revisit and use