While the term “defensible space” is widely referenced in literature on situational crime pre vention and Crime Prevention Through Environmental Design, it is commonly mentioned in passing, almost as an historical landmark, with its relationship to more recent work assumed rather than rigorously examined. Yet, Oscar Newman’s work bridged the gap between criminological theories and preventive approaches in the pre-1970s era and the more grounded and policy driven approaches that are common today. Consequently, this article looks at the context within which Newman developed his ideas and revisits his core work. It then considers the initial response from the criminology and planning communities, which focused on the methodological and theoretical weaknesses that undermined what were, essentially, a series of imaginative, exploratory propositions about the influence of design on crime patterns. In this sense, it is clear that Newman both provoked and inspired further research into the relationship between urban design and crime, and indeed, between crime, crime targets, and space, looking at the specific influence of design, technology, social engineering, and so on. Terms such as ownership, visibility, occupancy, accessibility, image, and juxtaposition, which Newman used, are now incorporated into more sophistical theories of situational crime prevention. This article thus offers a reanalysis of defensible space in the context of later refinements and the application of Newman’s ideas to current policies.