Whether as a goal for cities, or a discourse on urban futures, the concept of the ‘smart city’ is central to established, perhaps even dominant, narratives. Although it has (more-or-less successfully) absorbed objectives of innovation, creativity and environmental efficiency, the ‘smart city’ has been consistently contested, particularly over its social and political dimensions. This chapter outlines an alternative concept or narrative, that of the ‘sharing city’, and explores the overlaps, contrasts and interactions between ideas of smart and sharing cities with the aim of proposing a more socially and environmentally sustainable future orientation for cities.