What kind of stuff makes cities? What sorts of relations between humans, materials, infrastructures, animals, plans, substances, climates, machines, imaginaries, labours, foodstuffsthingsare mobilized to produce the dense, vibrant, provisional assemblage that we call a city? What happens when such relational flows become blocked, broken or otherwise constrained? What is distinctive, if anything, about the substance of African cities? These are a few of the questions that lie behind our preoccupation with urban materialities in Africa, and the promise of stuff for thinking through what makes African cities workand, conversely, for unravelling what happens when things fall apart.This special issue brings together six articles examining the contested materialities of African cities, building on an emerging focus on the stuff and substance of urban Africa (e.g. Hoffman 2017; Melly 2017; Smith 2019; Archambault 2018). This recent work constitutes a turn away from prevailing themes in the scholarship of African cities. Such themes have, until recently, been dominated by the invisible, informal and ephemeral as defining features of African urbanism (De Boeck and Plissart 2004;Guyer 2004;Simone 2004a;Nuttall and Mbembe 2008). The longevity of such themes is in some ways surprising given the earlier 'materiality turn' in anthropology, science and technology studies, human geography and cognate disciplines, which generated a wealth of influential, materially minded research (