This research examines the role of deprovincialization, conceptualized in terms of a nuanced perspective on one's in-group culture, for majority members' support for immigrants' cultural practices and expressive rights. In three studies using data from samples drawn from nationally representative panels in the Netherlands (additionally analyzed in an internal meta-analysis of N = 1,791), it was found that deprovincialization is a unique and robust predictor of support for immigrant rights, above and beyond prejudicial feelings, political orientation, level of education, gender, age, and religious affiliation. Furthermore, deprovincialization was found to be independent of national identification, which in previous research has been used as a proxy for deprovincialization. Additionally and in trying to conceptually replicate the pattern of findings (Studies 2 and 3), two different measures of perceived concern about the continuity of the in-group culture and identity were found to weaken the deprovincialization-support association. The findings go beyond existing research by focusing on the cultural openness understanding of deprovincialization and demonstrating the robust importance of how majority members understand their in-group for their support of immigrants' practices and rights. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.