Latin American elites authored and disseminated ideologies of mestizaje or race mixture, but does the general population value them today? Using the 2010 Americas Barometer, we examined public opinion about mestizaje in Bolivia, Brazil, Colombia, the Dominican Republic, Ecuador, Guatemala, Mexico, and Peru using survey questions that modeled mestizaje both as a principle of national development and as tolerance for intermarriage with black or indigenous people. We found that most Latin Americans support mestizaje, although support varies by country and ethnicity. Across countries, we find partial evidence that the strength of earlier nation-making mestizaje ideas is related to support for mestizaje today, and that strong multicultural policies may have actually strengthened such support. Ethnoracial minorities showed particular support for the national principle of mestizaje. Finally, we discovered that the national principle of mestizaje is associated with more tolerant attitudes about intermarriage, especially in countries with large Afro-descendant populations.