Existing research makes competing predictions and yields contradictory findings about the relationships between natives' exposure to immigrants and their attitudes toward immigration. Engaging this disjuncture, this article argues that individual predispositions moderate the impact of exposure to immigrants on negative attitudes toward immigrants. Negative attitudes toward immigration are more likely among individuals who are most sensitive to such threats. Because country-level studies are generally unable to appropriately measure the immigration context in which individuals form their attitudes, this article uses a newly collected dataset on regional immigration patterns in Austria, Germany, and Switzerland to test the argument. The data show that increasing and visible diversity is associated with negative attitudes toward immigrants, but only among natives on the political right. This finding improves the understanding of attitudes toward immigrants and immigration and has implications for the study of attitudes toward other policies and for immigration policy itself.The relationship between the presence of immigrants and citizens' attitudes toward immigrants and migration policies is uncertain and frequently debated. One perspective represented in many studies suggests that 'an increase in the percentage of ethnic minority members … reduces the majority's prejudice' (Wagner et al. 2006: 380). Another group of studies contradicts this finding, as exemplified by Quillian (1995: 602): 'prejudice is more likely when there is a large foreign presence'. These divergent findings align with the competing predictions from theories of natives' attitudes towards immigrants. Ethnic competition theory and realistic group conflict theory see exposure to outgroups, especially those from ethnically and culturally distinct origins, as leading to anti-immigrant attitudes among natives (Quillian 1995). Conversely, intergroup contact theory (e.g. Allport 1954) argues that larger outgroup populations can engender positive attitudes, although the eponymous 'contact' mechanism takes time to develop and its benefits are conditional on relative socioeconomic equality. On a different