A multicomponent model of multiculturalism by the Canadian cross-cultural psychologist John W. Berry is one of the most famous approaches designed to ensure the harmonization of intercultural relations in a plural society. Today including in Russia an applicability of this model has been widely investigating. However, in the light of social cognition, the model does not clearly define relations between the multicultural ideology and various principles of intergroup categorization; the existing empirical findings within the framework of the Berry’s model and within social cognition still to some extent consider intergroup relations somewhat isolated from each other. In this present exploratory study was examined the relationships between interethnic categorization (assimilation, colorblind, multicultural, polycultural) and multicultural ideology by Berry. A survey of ethnic Russians from the Central Federal District of Russia was conducted. The results showed that the multicultural ideology was positively associated with the colorblind, multicultural, and polycultural categorization and also negatively with the assimilation one. Although the colorblind categorization that purportedly rejects cultural diversity was positively associated with the multicultural ideology, this relation had small effect size. The findings of the study suggested that an acceptance and endorsement of cultural diversity and egalitarianism in Russia that according to Berry is a content core of the concept multiculturalism can be realized through polycultural, multicultural, and to a lesser extent through colorblind categorization.