Social justice, space and the city. A theorical methodological approach applied to a case study. - Traditional approaches at the studying of “social justice” issues within cities do not usually define clearly how we can understand both “justice” and “the city”. This article faces this issue, tracing an account of justice based upon both an explicit ethics and the relative principle of justice. With these concepts, the article defines a methodology of work that might be useful to grasp social justice matters within the urban, understanding these issues only in relational terms arguing, in other words, that it is necessary to look within the relational processes of the production of urban space to retrieve injustice. Hence, it would apply this methodology to a specific case study based on Turin. The conclusions will offer some suggestion upon the limitations and the opportunities of the path just outlined, as well as some proposition concerning its possible future developments.