Does immigration challenge the identities and cultural diversity of receiving societies? This paper investigates this question by analyzing the impact of immigration on cultural diversity in Europe between 2004 and 2018. It combines regional cultural diversity indices derived from the European Social Survey with immigration shares from the European Labor Force Survey. The findings indicate that immigration increases the salience of birthplace along cultural lines and fosters a shift toward nativist identities and nationalism among the population. In response to the perceived challenge of cultural diversity, natives increasingly align their norms and values with those of the broader native-identified population.