We explored the effects of language-based stigma on the relationship between native and nonnative speakers. In two studies, we found that stigmatized nonnative speakers experienced more negative interpersonal interactions, higher levels of intergroup threat, and reduced performance on an English test compared with nonnative speakers who did not experience stigma. These effects were mediated by anxiety and moderated by prevention-related goals. Furthermore, native speakers perceived stigmatized (vs. not-stigmatized) speakers’ accents as stronger and their commitment to living in the host country as weaker. Our findings suggest that experiencing language-based stigma can (a) incite a stereotype threat response from nonnative speakers, and (b) damage their relationship with native speakers on an interpersonal and intergroup level.