This volume explores linguistic diversity and complexity in different urban contexts, many of which have never been subject to significant sociolinguistic inquiry. A novel mixture of cities of varying size from around the world is studied, from megacities to smaller cities on the national periphery. All chapters discuss either the multilingualism or the pluricentric aspect of the linguistic diversity in urban areas, most focussing on one urban centre. The book showcases multiple approaches ranging from a quantitative investigation based partly on census data, to qualitative studies flowing, for example, from extensive ethnographic work or discourse analysis. The diverse theoretical backgrounds and methodological approaches in the individual chapters are complemented by two chapters outlining the current trends and debates in the sociolinguistic research on urban multilingualism and pluricentricity and suggesting some possible directions for future investigations in this field.The book thus provides a broad overview of sociolinguistic research of multilingual places and pluricentric languages.