The central purpose of this chapter is to consider how complexity might usefully be applied to the study of regulation and regulatory systems. As with any field, one must be cautious when cross-applying a new and unfamiliar perspective and its associated methodologies to something like regulation. One of the central claims made here is that in order for this to be a meaningful exercise, complexity needs to piggyback onto existing concepts from regulation scholarship in order to distinguish and make sense of important patterns of relationships within a regulatory environment. It proposes that the concept of the ‘regulatory space’ can be a useful handmaiden for this purpose and offers a new conceptual framework of the ‘complex regulatory spac...