A number of scholars within the social sciences have remarked that we are in the midst of both an ‘infrastructural moment’ – with massive symbolic and financial investment in, especially, energy, digital and transport infrastructures – and an ‘infrastructural turn’ – with a growing and increasingly diverse use of the notion in various research areas (see, e.g., Amin, 2014; Howe et al., 2016; Harvey et al., 2016; Chatzis, 2017; Jarrige et al., 2018; Lawhon et al., 2018; Pike et al., 2019; Addie et al., 2020). 1 Indeed, infrastructures have been at the forefront of major and interrelated transformations for several decades, from the intensification of global environmental changes (such as climate change) and responses to these changes to the ongoing, multifaceted ‘digital transition’, through accelerated processes of urbanisation, and increased economic and metabolic2 globalisations. This context has fuelled a renewed interest in infrastructures in public and academic debates. This Handbook of Infrastructures and Cities reflects and builds on this context.