Based upon predictions from 1996 about future trends in ethnocentric reactions in the Netherlands, we investigate the trends in ethnocentric reactions among the general public from 1979 to 2012. We distinguish two forms of ethnocentric reactions: negative attitudes towards ethnic minorities and public support for ethnic discrimination. In line with one of the predictions from 1996, we find an increase in negative attitudes towards ethnic minorities. Although this relates to increasing levels of diversity in the Netherlands, this finding may also reflect a decrease in the social norm that prohibits overt negative stances towards ethnic minorities. With regard to public support for ethnic discrimination, we find no clear upward or downward trend since the mid-nineties. Lower educated and older birth cohorts show stronger ethnocentric reactions. Although there are some indications that those with secondary educational levels and the youngest birth cohorts show stronger ethnocentric reactions over time, there are no significant differences in trends across educational levels and birth cohorts. Changes in ethnocentric reactions are rather robust across different social categories.