Authors: Arampatzi, A Article; Early Access. J. Urban Aff.. vol: . page: 0735-2166. Date: . . Doi: 10.1080/07352166.2020.1814677. Abstract: The social solidarity economy (SSE), as an alternative paradigm to crisis-prone market-driven capitalism, gained significant momentum during the last decade in cities such as Madrid and Athens that experienced the harsh impact of neoliberal austerity. This article consolidates a debate between divergent accounts of social economy and the commons, in order to bring forward the urban dimension of SSE and the contested spatiality of commoning in crisis-ridden contexts. This gesture lays the ground for unearthing various analytical dimensions of commoning, from urban-based socioeconomic practice, to re-instituting forms of urban commons via governance and policy channels. Through an empirically informed, comparative account of the SSE in Madrid and Athens, the article critically assesses the possibilities and limitations encountered in the process of expanding resistancetoand experimentationbeyonddominant socioeconomic practice and given institutional arrangements. The article is based on extensive original empirical research conducted in Madrid and Athens between 2017 and 2019..