This special issue offers different perspectives on translanguaging in an age of increased and shifting modes of mobility in diverse European contexts. Linguistic diversity has long been at the heart of European Union policies (e.g., Charter of Fundamental Rights of the European Union 2012); however, the surge of migration in Europe has resulted in new opportunities and challenges across public institutions, including schools as well as healthcare, the legal system, immigration services, and workplaces. Changing mobility patterns and increasing digitalization, including new patterns of communication that involve diverse languages and modalities, have impacted on people’s lives. Within increasingly normalized multilingual practices in the European context, with the “blurring [of] the lines between languages and nations” (Choudhury 2017), the notion of translanguaging offers a relevant perspective for understanding the linguistic, semiotic, and sociocultural aspects of ever-changing realities. The aim of this special issue is to illuminate how a translanguaging lens can be used to understand language practices in different European settings characterized by mobility.