Globalization brings forth a geographical and thematic expansion of the scope of youth studies beyond the traditional topics of delinquency, studies of generations, and subculture. Youth has emerged as a topic for cosmopolitanism studies with a widespread tendency to use cosmopolitanism as a master narrative that leaves no conceptual room for considering ‘non-cosmopolitan’ on an equal footing. The article questions whether social research should be concerned with identifying the cosmopolitanism of youth or whether it should be concerned with examinations of the glocalization of world’s youth (sub-)cultures. In the article’s last section, I outline a research agenda that focuses upon the relationship between the world’s youth (sub-)cultures, on the one hand, and glocalization and trans-localization, on the other. Use of these concepts offers important insights into the youth's cultural practices and is an alternative to the master narrative of cosmopolitanization.