This article explores the debate about contested space in urban policy and planning. Beginning with a review of key concepts and theories, it proceeds to identify models for understanding such spaces and for effective public intervention. It takes a case study of Belfast, on which there is substantial literature and data, to explore whether the recent history of this city can contribute to the debate about the role of urban planning and policy in contested space. Finally, it suggests that the Belfast experience indicates the need for a broader framework of intervention than is possible within a purely planning paradigm.