Multicultural ideology suggests that group memberships should be not just recognized but also valued in order to accommodate diversity and achieve equality. In three studies conducted in Spain and Canada this study explored, employing different measures, the relationship between multicultural ideology on the one hand and prejudice, support for social policies, and motivation for social change on the other hand. In Spain, it centered on responses to Gitanos (Spanish Roma) and, in Canada, on First Nations people. Results displayed that multicultural ideology was linked in both cases to lower prejudice and higher support for social policies to back the minority group and motivation for social change. The internal motivation to control prejudice was a notable mediator of this relationship in both countries. In contrast, the way in which social identities are represented played a different role as a function of country: whereas a dual identity representation played a mediating role in Canada, a common identity representation was the mediator in Spain. These outcomes back the importance of valuing cultural diversity to harmonize intergroup relations and to decrease disparities between majorities and minority groups.