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According to Intergroup Threat Theory (Stephan, Ybarra, & Rios, 2015), perceived threats from outgroups can be categorised into realistic threats (to the ingroup’s power, resources, or well-being) and symbolic threats (to the ingroup’s values, identity, or way of life). Although many studies have documented correlations between such threats and intergroup attitudes, experimental and quasiexperimental tests of Intergroup Threat Theory are relatively sparse. In the present article, we review our own and others’ research on manipulations, moderators, and consequences of realistic and symbolic threat, with close attention to the ways in which these threats are similar vs. different. Given the growing racial, ethnic, and cultural diversity in the Western world, understanding how and under what conditions each type of threat can be causally induced is critical to reducing threat and ultimately improving intergroup harmony.