The concept of urban borderlands helps us to understand how divisions take <em>place</em> in the city. Urban borderlands expand territorially beyond the mere linear border, drawing together what exists in or across both sides of the divide. In that they are not merely physical, but of course always socially, culturally, and experientially densely charged, the notion of the urban borderland offers itself as a useful analytic in the study of urban conditions that are marked by contiguity and coexistence. Contributions in this issue explore the potential of urban borderline studies across global cities, spanning various scales and employing theoretical frameworks such as borderlands, liminality, and multiple identities. This issue emphasizes the importance of considering bordering processes in urban planning and design and shows that urban borderlands are sites of contestation, negotiation, and coexistence, offering valuable lessons for the future of urban research and practice.