In a globally connected world, it is increasingly common for individuals to belong to and be influenced by more than one culture. Based on a critique of conceptualizations from psychology, management, marketing, anthropology, and sociology, we bring clarity and consistency to conceptualizing and measuring multiculturalism at the individual level. We propose that individual-level multiculturalism is the degree to which someone has knowledge of, identification with, and internalization of more than one societal culture, and recommend methods to measure each dimension. Finally, we suggest how individual-level multiculturalism influences, and is influenced by, social networks and power dynamics in international organizations.