Few bullying studies focus on immigrant youths or acculturation stress as a risk factor for bullying and being bullied. Employing a sample of 1,157 foreign-born secondary students in Spain, we found that acculturation stress was widely experienced, although the average level of stress was moderate. Five percent of the sample reported being bully-victims; that is, simultaneously being a perpetrator and victim of bullying. Another 5% reported only victimization experience, and 12% reported only perpetration experience. Multinomial logistic regression results showed that acculturation stress was associated with increased odds of being a bully-victim but not with the odds of being just a victim or the odds of being just a perpetrator. The findings highlight areas for future research exploring the chronology of perpetration and victimization for bully-victims, whether bullies of immigrant youths are immigrants or natives, and relations between sources of acculturation stress and forms of bullying. (Contains 2 tables.)