El barrio, the Spanish neighbourhood, has been mobilised by contemporary social movements in Madrid. El barrio provides an open framework that puts neighbours, both citizens and non-citizens, in contact via the spaces of everyday life. In this thesis, I draw on Henri Lefebvre’s thinking to elaborate a spatial history of modes of political belonging grounded in el barrio. I illustrate how contemporary mobilisations echo and differ from earlier battles. El barrio is simultaneously a space where dominant notions of citizenship are grounded and where grassroots alternatives emerge. Historical perspective gained contributes a more nuanced understanding of contemporary mobilisations.