This volume collects a selection of papers presented at the Third International Colloquium on Plurilingualism, held from 8 to 12 November 2021 at the International Center on Plurilingualism of the University of Udine, within a series of biennial meetings intended to offer to the specialists in the sector a meeting point for free discussion and exchange of information and experiences. It represents an up-to-date reading on a very topical issue of our societies, mainly aimed to an academic audience, but also open to the wider set of people interested in the phenomenon on an international scale.