Dropout from upper secondary education is a persistent educational problem, particularly among first-generation immigrant youth. This study examined factors associated with intentions to dropout to gain further insight into the process of leaving upper secondary education. The analyses of 1299 Norwegian first-year upper secondary school students' (88% native Norwegians, 12% first-generation immigrants) self-reported intentions to quit school, loneliness, and peer victimization in school showed that first-generation immigrants experienced higher levels of loneliness than native Norwegians. In contrast, there were no differences in the levels of peer victimization and intentions to quit between native Norwegians and first-generation immigrants. However, loneliness showed a significantly stronger association with intentions to quit among first-generation immigrants. The results underscore the importance of tackling first-generation immigrants' loneliness in school to reduce their intentions to quit upper secondary education and thus potentially improve conditions for school completion.