Americans generally celebrate the abstract principle of diversity, but research suggests that they have a comparatively lower (1) favorability towards policies that promote diversity and (2) sense of personal closeness with others from diverse backgrounds. The current study analyzes nationally representative survey data to assess such “principle-policy gaps” and “principle-personal gaps” in Americans’ diversity attitudes. We find that these attitudinal gaps indeed exist and are substantial in the general population. We also consider how individual-level factors relate to these attitudinal gaps. Following common findings in previous research, we find that participant racial identity and political partisanship have statistically significant relationships with these attitudinal gaps. But our overall findings illustrate that principle-policy gaps and principle-personal gaps in diversity attitudes are fairly substantial and prevalent across Americans who vary by race, politics, and several other individual-level factors. We consider our findings in the current social and political context, and we discuss directions for future inquiry.