Spatial planning has embraced the idea of dealing with territorial inequalities by focusing on equipment logic on a national scale, and then economic development on a local scale. Today, this issue is creating new angles of debate with strong political resonances (e.g. Brexit, French gilets jaunes movement). Interpretations of these movements are often quick and binary, such as: the contrast between metropolises and peripheries, between cities and the countryside, between the north and the south or between the east and the west of the European Union. Territorial Inequalities sheds light on the social, political and operational implications of these divergences. The chapters cover the subject at different scales of action and observation (from the neighborhood to the world), but also according to their interdependences. To deal with such a vast and ambitious theme, the preferred approach is that of territorial development in terms of public policy, namely spatial planning.